JP7470904B2 - Separation System - Google Patents

Description

The present invention relates to a separation system. More specifically, the present invention relates to a separation system that separates solids contained in a gas from the gas.

Conventionally, a separation device that separates solids from gas is known that includes a rotor, a frame, multiple partitions (vanes), multiple flow paths, and a rotating plate (see Patent Document 1).

The frame is cylindrical. The frame is arranged coaxially with the rotor, surrounding the rotor. The partition plates are arranged in the space between the rotor and the frame to divide the space. Each of the multiple flow paths is defined by two adjacent partition plates among the multiple partition plates, the rotor, and the frame. The rotating plate is annular. The rotating plate is connected to the multiple partition plates. Each of the multiple partition plates is connected to the rotor. In each of the multiple flow paths, the first end side of the rotor is the upstream side in the direction along the central axis of rotation of the rotor, and the second end side of the rotor is the downstream side. The separation device includes at least one central outlet that is located closer to the central axis of rotation than the multiple partition plates on the downstream side of each of the multiple flow paths, communicates with at least one of the multiple flow paths, and is open in a direction perpendicular to the central axis of rotation, and an outer peripheral outlet that is located outside the multiple partition plates in the direction perpendicular to the central axis of rotation on the downstream side of each of the multiple flow paths, communicates with at least one of the multiple flow paths, and is open in a direction perpendicular to the central axis of rotation. The rotating plate is large enough to cover the multiple partition plates and spaces downstream of each of the multiple flow paths.

In the separation device described in Patent Document 1, the rotating plates are arranged so that the thickness direction of the rotating plates is aligned along the central axis of rotation of the rotor. Therefore, the separation device described in Patent Document 1 can efficiently separate solids from gas, but the pressure loss is large.

International Publication No. 2016/163075

The objective of this disclosure is to provide a separation system that can improve separation performance while suppressing pressure loss.

A separation system according to one aspect of the present disclosure includes a cylinder and a rotor. The cylinder has a gas inlet at a first end, a gas outlet at a second end, and a plurality of exhaust holes penetrating in a direction intersecting the axial direction between the first end and the second end. The rotor is disposed inside the cylinder and is rotatable about a central axis of rotation along the axial direction of the cylinder. The rotor has blades that generate a swirling airflow within the cylinder when the rotor rotates. The cylinder is longer in the axial direction than the rotor. The separation system further includes a cylindrical inner cylinder portion. The inner cylinder portion is located inside the cylinder between the rotor and the outlet in the axial direction. The inner space of the inner cylinder portion is connected to the inner space of the cylinder.

A separation system according to another aspect of the present disclosure includes a cylinder and an inner cylinder portion. The cylinder has a gas inlet at a first end, a gas outlet at a second end, and a discharge hole penetrating in a direction intersecting the axial direction between the first end and the second end. The inner cylinder portion is disposed inside the cylinder and is shorter than the cylinder in the axial direction. The separation system separates the swirling airflow that flows in from the inlet of the cylinder into a first airflow that passes inside the inner cylinder portion and a second airflow that passes outside the inner cylinder portion, and discharges the second airflow from the discharge hole.

The separation system disclosed herein can improve separation performance while suppressing pressure loss.

FIG. 1 is a partially cutaway perspective view of a separation system according to a first embodiment. FIG. 2A is a front view of the separation system. FIG. 2B is a left side view of the separation system. FIG. 2C is a right side view of the separation system. FIG. 3 shows the same separation system, and is a cross-sectional view taken along line AA of FIG. 2C. FIG. 4 shows the same separation system, and is a cross-sectional view taken along line BB of FIG. 2A. FIG. 5 is a perspective view of a cylindrical body in the separation system. FIG. 6 is a perspective cutaway view of a separation system according to a second embodiment. FIG. 7A is a front view of the separation system. FIG. 7B is a left side view of the separation system. FIG. 7C is a right side view of the separation system. FIG. 8 shows the same separation system, and is a cross-sectional view taken along line AA of FIG. 7C. FIG. 9 shows the same separation system, and is a cross-sectional view taken along line BB of FIG. 7A. FIG. 10 is an explanatory diagram of the main parts of the separation system. FIG. 11 is a graph showing the relationship between the position of the upstream end of the inner cylindrical portion relative to the rotor when viewed from the axial direction of the cylindrical portion and the dust removal rate in the separation system. FIG. 12 is a perspective cutaway view of a separation system according to a third embodiment. FIG. 13 is a right side view of the separation system. FIG. 14 shows the same separation system, and is a cross-sectional view taken along line AA in FIG. FIG. 15 is a right side view of the separation system according to the fourth embodiment. FIG. 16 shows the same separation system, and is a cross-sectional view taken along line AA in FIG. FIG. 17 is a partially cutaway perspective view of a separation system according to the fifth embodiment. FIG. 18 is a right side view of the separation system. FIG. 19 shows the same separation system, and is a cross-sectional view taken along line AA in FIG.

(Embodiment 1)
Hereinafter, a separation system 1 according to a first embodiment will be described with reference to Figs. 1 to 5. Fig. 1 is a partially cutaway perspective view of the separation system 1 according to the first embodiment. Fig. 2A is a front view of the separation system 1. Fig. 2B is a left side view of the separation system 1. Fig. 2C is a right side view of the separation system 1. Fig. 3 is a cross-sectional view of the separation system taken along line A-A in Fig. 2C. Fig. 4 is a cross-sectional view of the separation system taken along line B-B in Fig. 2A. Fig. 5 is a perspective view of a cylinder in the separation system.

(1) Overview The separation system 1 according to the first embodiment is provided, for example, upstream of an air conditioning facility having a blowing function, and separates solids in air (gas). The air conditioning facility is, for example, a blower that blows air from the upstream side to the downstream side. The blower is, for example, an electric fan. The air conditioning facility is not limited to a blower, and may be, for example, a ventilator, an air conditioner, an air supply cabinet fan, or an air conditioning system equipped with a blower and a heat exchanger. The flow rate of air flowing into the separation system 1 by the air conditioning facility is, for example, 100 m ³ /h to 300 m ³ /h. The flow rate of air flowing into the separation system 1 is substantially the same as the flow rate of air flowing through the air conditioning facility.

As shown in Figs. 1 to 4, the separation system 1 includes a cylinder 2 and a rotor 3. The cylinder 2 has a gas inlet 23 at a first end 21 and a gas outlet 24 at a second end 22. The cylinder 2 has a discharge hole 25 penetrating in a direction intersecting the axial direction of the cylinder 2 (thickness direction of the cylinder 2). The discharge hole 25 is a hole for discharging solids contained in the air to the outside of the cylinder 2. The discharge hole 25 connects the inner space of the cylinder 2 to the outer space of the cylinder 2. In other words, the discharge hole 25 connects the inside and outside of the cylinder 2. The rotor 3 is disposed inside the cylinder 2. The rotor 3 has a blade 36 that generates a swirling airflow in the cylinder 2 when the rotor 3 rotates. In the separation system 1, a flow path 200 is formed between the cylinder 2 and the rotor 3, from the inlet 23 to the outlet 24.

The separation system 1 further includes a motor 4. The motor 4 rotates the rotor 3. Here, the separation system 1 further includes a shaft 7 connected to both the rotor 3 and the rotation shaft 42 of the motor 4 (see FIG. 3).

The separation system 1 further includes a cylindrical inner tube portion 5. The inner tube portion 5 is located inside the tube body 2, between the rotor 3 and the outlet port 24 in the axial direction of the tube body 2. The inner space of the inner tube portion 5 is connected to the inner space of the tube body 2.

The separation system 1 further includes a housing 6. The housing 6 is disposed outside the cylindrical body 2 and houses the cylindrical body 2.

The separation system 1 further includes an exhaust duct 9. The exhaust duct 9 is connected to the housing 6 on the outside of the inner cylinder portion 5. The inner space of the exhaust duct 9 is connected to the space between the housing 6 and the cylinder body 2.

The separation system 1 can direct air that has flowed into the flow path 200 from the upstream side to the downstream side of the flow path 200 while rotating the air in a spiral shape around the rotor 3. In this case, "upstream side" refers to the upstream side (primary side) when viewed in the direction of air flow. Additionally, "downstream side" refers to the downstream side (secondary side) when viewed in the direction of air flow.

Examples of solids in the air include fine particles and dust. Examples of fine particles include particulate matter. Particulate matter includes primary particles that are directly released into the air as fine particles, and secondary particles that are released into the air as gas and then generated as fine particles in the air. Examples of primary particles include soil particles (yellow sand, etc.), dust, plant particles (pollen, etc.), animal particles (mold spores, etc.), soot, etc. Particulate matter can be classified by size, for example, into PM (Particulate Matter) 1.0, PM2.5 (fine particulate matter), PM10, SPM (Suspended Particulate Matter, suspended particulate matter), etc. PM1.0 is a fine particle with a particle diameter of 1.0 μm that passes through a particle size separator with a collection efficiency of 50%. PM2.5 is a fine particle with a particle diameter of 2.5 μm that passes through a classifier with a collection efficiency of 50%. PM10 is a fine particle with a particle diameter of 10 μm that passes through a classifier with a collection efficiency of 50%. SPM is a fine particle with a particle diameter of 10 μm that passes through a classifier with a collection efficiency of 100%, and is equivalent to PM6.5-7.0, and is slightly smaller than PM10.

(2) Details As described above, the separation system 1 includes the cylindrical body 2, the rotating body 3, the inner cylindrical portion 5, the housing 6, the motor 4, and the shaft 7.

The cylinder 2 is formed in a cylindrical shape. The cylinder 2 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, ABS resin.

As described above, the cylinder 2 has discharge holes 25 penetrating between the first end 21 and the second end 22 of the cylinder 2 in a direction intersecting the axial direction of the cylinder 2. The cylinder 2 has a plurality of discharge holes 25 (44 in the illustrated example). Each of the plurality of discharge holes 25 is substantially a quarter arc shape as shown in FIG. 5. Each of the plurality of discharge holes 25 is aligned in the circumferential direction and the axial direction of the cylinder 2. This makes it possible for the separation system 1 to discharge solids passing near the inner circumferential surface 27 of the cylinder 2 from the discharge holes 25 regardless of the size of the solids in the air flowing into the cylinder 2 or the position in the axial direction of the cylinder 2. The plurality of discharge holes 25 includes a first group (32 in the illustrated example) of discharge holes 25 located outside the rotating body 3 and a second group (12 in the illustrated example) of discharge holes 25 located outside the inner cylinder portion 5, as shown in FIGS. 1 and 3.

The rotor 3 is disposed coaxially with the cylindrical body 2 inside the cylindrical body 2. "Disposed coaxially with the cylindrical body 2" means that the rotor 3 is disposed so that the central axis of rotation A3 (see FIG. 3) of the rotor 3 is aligned with the central axis A2 (see FIG. 3) of the cylindrical body 2. As shown in FIG. 2C, FIG. 3, and FIG. 4, the rotor 3 has a plurality of blades 36 and a rotor body (hub) 30. The base ends 361 of the plurality of blades 36 are connected to the rotor body 30. The rotor body 30 is cylindrical. The material of the rotor body 30 is, for example, polycarbonate resin.

In the direction along the central axis A3 of the rotor 3, the length of the rotor 3 is shorter than the length of the cylindrical body 2.

As shown in FIG. 3, the rotor body 30 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 rotor body 30 is disposed near the inlet 23 in the axial direction of the cylinder 2 (the direction along the central axis A2 of the cylinder 2). The second end 32 of the rotor body 30 is disposed near the outlet 24 in the axial direction of the cylinder 2.

A plurality of (here, 23) blades 36 are arranged between the cylinder 2 and the rotor body 30. Each of the blades 36 has a base end 361 and a tip end 362. The base ends 361 of the blades 36 are connected to the rotor body 30. Each of the blades 36 is formed from the first end 31 to the second end 32 of the rotor body 30. The material of the blades 36 is, for example, polycarbonate resin. In the rotor 3, the material of the rotor body 30 and the material of the blades 36 are the same, but may be different.

Each of the vanes 36 is flat. Each of the vanes 36 is arranged parallel to the central axis of rotation A3 of the rotor 3 in the space (flow path 200) between the outer circumferential surface 37 of the rotor main body 30 and the inner circumferential surface 27 of the cylindrical body 2. As shown in Figures 3 and 4, each of the vanes 36 is arranged such that a gap is formed between the tip 362 of the vane 36 and the inner circumferential surface 27 of the cylindrical body 2. In other words, in the separation system 1, there is a gap between each of the vanes 36 and the inner circumferential surface 27 of the cylindrical body 2.

Each of the multiple blades 36 is arranged so as to intersect in a direction along the circumferential direction of the rotating body 30. The multiple blades 36 are arranged at equal angular intervals in the circumferential direction of the rotating body 30. The "equal angular intervals" mentioned here are not limited to strictly the same angular intervals, but may also be, for example, angular intervals that include an error within a predetermined error range.

In the separation system 1, as shown in FIG. 4, when viewed from the outlet 24 side in the axial direction of the cylinder 2, each of the multiple vanes 36 is inclined at a predetermined angle (e.g., 45 degrees) toward the rotation direction R1 of the rotor 3 with respect to one radial direction of the rotor main body 30. The predetermined angle is not limited to 45 degrees, and may be, for example, an angle within the range of 10 degrees to 80 degrees.

The rotating body 3 is connected to the rotating shaft 42 of the motor 4 via the shaft 7. More specifically, in the separation system 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. This allows the rotating body 3 to rotate together with the rotating shaft 42 and shaft 7 of the motor 4. In the separation system 1, the rotating shaft 42 and shaft 7 are arranged so as to be aligned in a straight line.

The motor 4 rotates the rotor 3 around the central axis A3 of the rotor 3. The rotation speed of the rotor 3 is, for example, 1500 rpm (revolutions per minute) to 3000 rpm. The motor 4 is, for example, a DC motor. The motor 4 is driven, for example, by an external drive circuit.

As shown in FIG. 3, the motor 4 includes a motor body 41 and the above-mentioned rotating shaft 42, a portion of which protrudes from the motor body 41. The rotating shaft 42 is cylindrical. The motor 4 is disposed upstream of the rotating body 3.

The shaft 7 is rod-shaped and has a first end 71 located on the inlet 23 side of the inlet 23 and an outlet 24 of the cylinder 2, and a second end 72 located on the outlet 24 side. The material of the shaft 7 is, for example, stainless steel. The shaft 7 is arranged so that its axis coincides with the central axis of rotation A3 of the rotor 3. In the separation system 1, the first end 71 of the shaft 7 is located inside the rotor main body 30, and the second end 72 of the shaft 7 is located on the outlet 24 side of the cylinder 2. The separation system 1 is provided with a bearing 8 that rotatably supports the shaft 7. The bearing 8 rotatably supports the second end 72 of the shaft 7.

The separation system 1 further includes a first cover 11 and a second cover 12. The first cover 11 is disposed on the upstream side of the cylinder 2. The second cover 12 is disposed on the downstream side of the cylinder 2. In the separation system 1, the cylinder 2 and the housing 6 are held by the first cover 11 and the second cover 12. The housing 6 is cylindrical and has a first end 61 and a second end 62. The housing 6 is disposed coaxially with the cylinder 2. "Disposed coaxially with the cylinder 2" means that the housing 6 is disposed so that the central axis of the cylindrical housing 6 is aligned with the central axis A2 (see FIG. 3) of the cylinder 2.

In the separation system 1, the motor 4 is removably attached to the first cover 11. The motor 4 is fixed to the first cover 11, for example, by a plurality of screws. In the separation system 1, the bearing 8 is fixed to the second cover 12.

As shown in Fig. 3, the first cover 11 is formed with an annular groove 114 that positions the first end 21 of the cylindrical body 2, and an annular groove 115 that positions the first end 61 of the housing 6. As shown in Fig. 3, the second cover 12 is formed with an annular groove 124 that positions the second end 22 of the cylindrical body 2, and an annular groove 125 that positions the second end 62 of the housing 6.

When viewed from the axial direction of the cylindrical body 2, the outer peripheral shape of the first cover 11 is, for example, a square shape (see FIG. 2B). The first cover 11 has a first frame portion 111, a first mounting portion 112, and four first beam portions 113. The outer peripheral shape of the first frame portion 111 is the same as the outer peripheral shape of the first cover 11. The inner peripheral shape of the first frame portion 111 is a circle. The inner diameter of the first frame portion 111 is larger than the outer diameter of the rotating body main body 30 and smaller than the inner diameter of the cylindrical body 2. The first mounting portion 112 is disk-shaped and is disposed inside the first frame portion 111. The motor 4 is attached to the first mounting portion 112. The four first beam portions 113 connect the first frame portion 111 and the first mounting portion 112. The four first beam portions 113 are disposed at equal intervals in the circumferential direction of the first mounting portion 112. The material of the first cover 11 is, for example, aluminum.

When viewed from the axial direction of the cylindrical body 2, the outer peripheral shape of the second cover 12 is square (see FIG. 2C). The second cover 12 has a second frame portion 121, a second mounting 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 second cover 12. The inner peripheral shape of the second frame portion 121 is circular. The inner diameter of the second frame portion 121 is smaller than the inner diameter of the cylindrical body 2, the same as the inner diameter of the inner cylindrical portion 5, and larger than the outer diameter of the rotating body main body 30. The second mounting portion 122 is disk-shaped and is disposed inside the second frame portion 121. The bearing 8 is attached to the second mounting portion 122. The bearing 8 is a rolling bearing, and is attached to the second mounting portion 122 by being pressed into the recess of the second mounting portion 122. The four second beams 123 connect the second frame portion 121 and the second mounting portion 122. The four second beams 123 are spaced apart at equal intervals in the circumferential direction of the second mounting portion 122. The material of the second cover 12 is, for example, aluminum.

The first frame portion 111 of the first cover 11 and the second frame portion 121 of the second cover 12 are connected via multiple rod-shaped connecting members arranged, for example, to surround the housing 6.

The inner cylinder portion 5 is located inside the cylinder body 2, between the rotor 3 and the outlet port 24 in the axial direction of the cylinder body 2. The inner cylinder portion 5 has an upstream end 51 on the rotor 3 side and a downstream end 52 on the outlet port 24 side. The inner cylinder portion 5 is fixed to, for example, the second cover 12. More specifically, in the inner cylinder portion 5, for example, the downstream end 52 of the inner cylinder portion 5 is fixed to the four second beam portions 123 of the second cover 12.

In the separation system 1, the inner diameter of the inner cylinder 5 is constant regardless of the axial position of the cylinder 2. The inner diameter of the inner cylinder 5 is smaller than the inner diameter of the cylinder 2 and larger than the outer diameter of the rotor main body 30. Therefore, the inner space of the inner cylinder 5 is connected to the inner space of the cylinder 2. The material of the inner cylinder 5 is, for example, ABS (Acrylonitrile Butadiene Styrene) resin.

The separation system 1 has a space S1 (see FIG. 3) formed between the inner cylinder 5 and the cylinder 2 and connected to the discharge hole 25. In the separation system 1, the space S1 is surrounded by the inner cylinder 5, the cylinder 2, and the second cover 12. In the separation system 1, the space S1 also functions as a reservoir for solids. In the separation system 1, a cavity 10 is formed inside the inner cylinder 5. Here, in the separation system 1, the motor 4 is disposed upstream of the cylinder 2, so a larger cavity 10 is formed inside the inner cylinder 5 compared to when the motor 4 is disposed inside the inner cylinder 5. In the separation system 1, no separate member is interposed between the part of the shaft 7 located inside the inner cylinder 5 and the inner cylinder 5, and only the cavity 10 is formed.

The housing 6 is disposed outside the cylindrical body 2 and houses the cylindrical body 2. The housing 6 is cylindrical. The inner diameter of the housing 6 is constant regardless of the position in the axial direction of the cylindrical body 2. The inner diameter of the housing 6 is larger than the outer diameter of the cylindrical body 2. The material of the housing 6 is, for example, ABS resin.

The exhaust duct 9 is connected to the housing 6 on the outside of the inner tube portion 5. The inner space of the exhaust duct 9 is connected to the space between the housing 6 and the cylindrical body 2. Here, the housing 6 has an exhaust hole 65 (see FIG. 4) between a first end 61 and a second end 62 in the axial direction of the housing 6. The exhaust duct 9 is connected to the periphery of the exhaust hole 65 on the outer peripheral surface 66 of the housing 6, for example. The exhaust duct 9 is a duct for discharging solids contained in the gas discharged into the housing 6 from the discharge hole 25 of the cylindrical body 2 to the outside of the housing 6.

As shown in FIG. 4, when viewed from the axial direction of the cylindrical body 2, the exhaust duct 9 extends from the outer peripheral surface 66 of the housing 6 in a direction along one tangent to the outer peripheral surface 66. Here, the one tangent direction is a direction along the rotation direction R1 of the rotating body 3. In the separation system 1, when viewed from the direction in which the exhaust duct 9 extends, the exhaust hole 65 of the housing 6 and at least a portion of at least one discharge hole 25 of the cylindrical body 2 overlap.

(3) Operation of Separation System An example of the operation of the separation system 1 will now be described.

In the separation system 1, the rotation direction R1 of the rotor 3 connected to the shaft 7 is the same as the rotation direction of the rotating shaft 42 of the motor 4. The rotation direction R1 of the rotor 3 is, for example, a clockwise direction when viewed from the outlet 24 side of the cylindrical body 2. The rotational angular velocity of the rotor 3 is the same as the rotational angular velocity of the rotating shaft 42 of the motor 4.

In the separation system 1, the rotation of the rotor 3 having the blades 36 makes it possible to apply a force in the rotational direction around the central axis of rotation A3 to the air that has flowed into the inner space (flow path 200) of the cylinder 2. In the separation system 1, the rotation of the rotor 3 having the blades 36 causes the velocity vector of the air flowing through the inner space of the cylinder 2 to have a velocity component parallel to the central axis of rotation A3 and a velocity component in the rotational direction around the central axis of rotation A3. In short, in the separation system 1, the rotation of the rotor 3 having the blades 36 generates a swirling airflow inside the cylinder 2. The swirling airflow is an airflow that rotates in a three-dimensional spiral.

In the separation system 1, outside air flows into the inlet 23 of the cylinder 2 through the space inside the first frame portion 111. The space inside the first frame portion 111 includes a space surrounded by the first frame portion 111, the first mounting portion 112, and two adjacent first beam portions 113 out of the four first beam portions 113 of the first cover 11. The solids contained in the air that has flowed into the cylinder 2 are subjected to centrifugal force in a direction from the rotation center axis A3 of the rotor 3 toward the inner circumferential surface 27 of the cylinder 2 when rotating spirally in the inner space (flow path 200) of the cylinder 2. The solids subjected to the centrifugal force move toward the inner circumferential surface 27 of the cylinder 2 and rotate spirally along the inner circumferential surface 27 near the inner circumferential surface 27 of the cylinder 2. A part of the solids in the air is discharged from the discharge hole 25 while passing through the inner space of the cylinder 2.

In the separation system 1, a swirling airflow (swirling flow) is generated inside the cylinder 2. As a result, some of the solids (dust, etc.) in the air that flows into the cylinder 2 from the inlet 23 of the cylinder 2 are discharged through the discharge hole 25, and some of the air (cleaned air) from which the solids (dust, etc.) have been separated (removed) flows out from the outlet 24 of the cylinder 2. Here, since the separation system 1 has an inner cylinder 5, the airflow F0 swirling inside the cylinder 2 is divided into a first airflow F1 that passes through the inside of the inner cylinder 5 and a second airflow F2 that passes outside the inner cylinder 5, as shown in FIG. 3. The second airflow F2 is discharged from the discharge hole 25 of the cylinder 2 outside the inner cylinder 5. In the separation system 1, since the inner cylinder 5 is present downstream of the rotor 3 inside the cylinder 2, the solids that have been swirling around the rotor 3 and not discharged from the discharge hole 25 are easily guided to the outside of the inner cylinder 5.

Regarding the separation characteristics of the separation system 1, the faster the rotation speed of the rotor 3, the higher the separation efficiency tends to be. Also, regarding the separation characteristics of the separation system 1, the larger the particle size, the higher the separation efficiency tends to be. In the separation system 1, for example, the rotation speed of the rotor 3 is preferably set so as to separate fine particles of a specified particle size or more. For example, particles with an aerodynamic particle diameter of 0.3 μm to 10 μm are assumed as fine particles of a specified particle size. "Aerodynamic particle diameter" means the diameter of a particle whose aerodynamic behavior is equivalent to that of a spherical particle with a specific gravity of 1.0. The aerodynamic particle diameter is a particle diameter calculated from the settling velocity of the particle. Examples of solids that remain in the air without being separated by the separation system 1 include fine particles with a smaller diameter than the fine particles expected to be separated by the separation system 1 (in other words, fine particles with a mass smaller than the mass of the fine particles expected to be separated by the separation system 1).

(4) Advantages The separation system 1 according to the first embodiment includes a cylinder 2 and a rotor 3. The cylinder 2 has a gas inlet 23 at a first end 21, a gas outlet 24 at a second end 22, and a discharge hole 25 penetrating in a direction intersecting the axial direction between the first end 21 and the second end 22. The rotor 3 is disposed inside the cylinder 2 and can rotate around a rotation center axis A3 along the axial direction of the cylinder 2. The rotor 3 generates an airflow F0 that swirls inside the cylinder 2 when the rotor 3 rotates. The cylinder 2 is longer than the rotor 3 in the axial direction. The separation system 1 further includes a cylindrical inner cylinder portion 5. The inner cylinder portion 5 is located inside the cylinder 2 between the rotor 3 and the outlet 24 in the axial direction of the cylinder 2. The inner space of the inner cylinder portion 5 is connected to the inner space of the cylinder 2.

With the above configuration, the separation system 1 according to the first embodiment can improve separation performance while suppressing pressure loss. The separation system 1 according to the first embodiment can suppress pressure loss. This can reduce the load on the motor 4, thereby achieving low power consumption. In the separation system 1 according to the first embodiment, it is also possible to make a solid that has entered the space S1 between the inner cylindrical portion 5 and the cylindrical portion 2 from the space between the cylindrical portion 2 and the rotor 3 stay in the space S1. The separation system 1 according to the first embodiment can improve separation performance. Therefore, compared to a case in which the inner cylindrical portion 5 is not provided, it is also possible to reduce the size of the rotor 3 (at least one of reducing the length of the rotor 3 in the direction along the rotation center axis A3 and shortening the outer diameter of the rotor 3). The shortening of the outer diameter of the rotor 3 can be achieved, for example, by reducing the outer diameter of the cylindrical rotor main body 30 of the rotor 3.

The separation system 1 according to the first embodiment further includes a housing 6. This prevents the solid matter discharged from the discharge hole 25 of the cylindrical body 2 from scattering.

The separation system 1 according to the first embodiment further includes an exhaust duct 9. This makes it easier for solids discharged from the discharge hole 25 of the cylindrical body 2 to be discharged through the exhaust duct 9. This allows the separation system 1 to reduce pressure loss compared to a separation device equipped with a mesh filter for capturing solids discharged from the discharge hole 25.

Furthermore, the configuration of the separation system 1 according to embodiment 1 other than the cylindrical body 2 may not be particularly limited as long as the following configuration is satisfied.

The separation system 1 according to the first embodiment includes a cylindrical body 2 and an inner cylindrical portion 5. The cylindrical body 2 has a gas inlet 23 at a first end 21, a gas outlet 24 at a second end 22, and a discharge hole 25 penetrating in a direction intersecting the axial direction between the first end 21 and the second end 22. The inner cylindrical portion 5 is disposed inside the cylindrical body 2 and is shorter than the cylindrical body 2 in the axial direction of the cylindrical body 2. The separation system 1 separates the airflow F0 (see FIG. 3) that flows in from the inlet 23 of the cylindrical body 2 and swirls into a first airflow F1 (see FIG. 3) that passes through the inside of the inner cylindrical portion 5 and a second airflow F2 (see FIG. 3) that passes through the outside of the inner cylindrical portion 5, and discharges the second airflow F2 from the discharge hole 25. This allows the separation system 1 to improve separation performance while suppressing pressure loss.

(5) Application Example of Separation System The separation system 1 is used, for example, in an air purification system installed in a facility or the like, by being placed upstream of an air filter such as a HEPA filter (high efficiency particulate air filter) that is placed upstream of an air conditioning device.

In this disclosure, a "facility" refers to, for example, a data center, a hospital, an office building, a factory, a commercial complex, an art gallery, a museum, an amusement facility, a theme park, an airport, a train station, a dome stadium, a hotel, a residence, etc. In addition, a "facility" may be, for example, a moving object such as a ship or a railroad car.

A "HEPA filter" is an air filter that has a particle collection rate of 99.97% or more for particles with a particle size of 0.3 μm at a rated flow rate and an initial pressure loss of 245 Pa or less. An air filter does not necessarily require 100% particle collection efficiency. By providing the separation system 1, the air purification system can prevent fine particles such as PM1.0 and PM2.5 from reaching the air filter. Therefore, the air purification system can extend the life of the air filter and other components downstream of the separation system 1. For example, the air purification system can prevent an increase in pressure loss due to an increase in the total mass of fine particles and other particles captured by the air filter. This makes it possible to reduce the frequency of replacing the air filter in the air purification system. The air purification system is not limited to a configuration in which the air filter and the air conditioning equipment are stored in different housings, and may include an air filter in the housing of the air conditioning equipment. In other words, the air conditioning equipment may include an air filter in addition to a blower.

(Embodiment 2)
Hereinafter, the separation system 1A according to the second embodiment will be described with reference to Figs. 6 to 9. Fig. 6 is a partially cutaway perspective view of the separation system 1A according to the second embodiment. Fig. 7A is a front view of the separation system 1A. Fig. 7B is a left side view of the separation system 1A. Fig. 7C is a right side view of the separation system 1A. Fig. 8 is a cross-sectional view of the separation system 1A taken along line A-A in Fig. 7C. Fig. 9 is a cross-sectional view of the separation system 1A taken along line B-B in Fig. 7A. In the separation system 1A according to the second embodiment, components similar to those of the separation system 1 according to the first embodiment are denoted by the same reference numerals and will not be described.

The separation system 1A according to the second embodiment differs from the separation system 1 according to the first embodiment in that the separation system 1A according to the second embodiment includes an inner cylinder portion 5A instead of the inner cylinder portion 5 of the separation system 1 according to the first embodiment.

The inner cylinder portion 5A, like the inner cylinder portion 5, is located inside the cylinder body 2 between the rotor 3 and the outlet port 24 in the axial direction of the cylinder body 2. The inner cylinder portion 5A has an upstream end 51A on the rotor 3 side and a downstream end 52A on the outlet port 24 side.

The inner cylinder portion 5A is cylindrical and has a different shape from the inner cylinder portion 5, and includes an expanded diameter portion 53A. The inner and outer diameters of the expanded diameter portion 53A increase in the axial direction of the cylinder body 2 as it approaches the outlet port 24 of the cylinder body 2. The inner cylinder portion 5A may have a portion with a constant inner diameter and a constant outer diameter in the axial direction of the cylinder body 2 in addition to the expanded diameter portion 53A.

The inner diameter of the upstream end 51A of the inner cylinder portion 5A is larger than the outer diameter of the rotor main body 30. The outer diameter of the upstream end 51A is smaller than the inner diameter of the cylinder body 2. The inner diameter of the downstream end 52A of the inner cylinder portion 5A is larger than the inner diameter of the upstream end 51A. The outer diameter of the downstream end 52A is larger than the outer diameter of the upstream end 51A. The outer diameter of the downstream end 52A is the same as the inner diameter of the cylinder body 2, but is not limited to this and may be smaller than the inner diameter of the cylinder body 2. The inner diameter of the downstream end 52A is the same as the inner diameter of the second frame portion 121.

The upstream end 51A of the inner cylinder portion 5A is located between the tip edge of the blade 36 and the rotor body 30 (outer peripheral surface 37) when viewed in the axial direction of the cylinder 2.

The separation system 1A according to the second embodiment includes an inner cylinder portion 5A. This makes it possible to improve separation performance while suppressing pressure loss, similar to the separation system 1 according to the first embodiment.

In the separation system 1A according to the second embodiment, the separation performance is improved compared to the separation system 1 according to the first embodiment. The reason for this is presumably that in the separation system 1A according to the second embodiment, the distance between the cylindrical body 2 and the inner cylindrical portion 5A in the radial direction of the cylindrical body 2 becomes shorter toward the downstream side in the axial direction of the cylindrical body 2 compared to the separation system 1 according to the first embodiment, so that solids contained in the airflow inside the cylindrical body 2 are more easily discharged from the discharge hole 25 of the cylindrical body 2 outside the inner cylindrical portion 5A.

Figure 10 is an explanatory diagram of the main parts of the separation system 1A according to the second embodiment. Figure 10 is a diagram for explaining the position of the upstream end 51A of the inner cylindrical portion 5A relative to the rotor 3 when viewed from the axial direction of the cylindrical body 2. In Figure 10, when the position of the outer periphery of the rotor main body 30 is set to 0% and the position of the envelope passing through the tip edges of the multiple blades 36 when viewed from the axial direction of the cylindrical body 2 is set to 100%, the upstream end 51A located at the 20%, 70%, and 100% positions in the radial direction of the cylindrical body 2 are shown by dashed lines C1, C2, and C3, respectively.

Figure 11 is a graph showing the relationship between the position of the upstream end 51A of the inner cylinder 5A relative to the rotor 3 when viewed from the axial direction of the cylinder 2 and the dust removal rate for the separation system according to the second embodiment. Note that the dust removal rate in Figure 11 is expressed as a percentage, which is the difference between the number of fine particles of a specified particle size (e.g., 1.0 μm) that flow into the inlet 23 and the number that flow out of the outlet 24, divided by the number that flows in.

From FIG. 11, it can be seen that in the separation system 1A according to embodiment 2, it is possible to improve the dust removal rate compared to a case in which the inner cylindrical portion 5A is not provided. It can be seen that if the upstream end 51A is located at 20% to 90% in the radial direction of the cylindrical body 2, it is possible to further improve the dust removal rate.

(Embodiment 3)
Hereinafter, a separation system 1B according to the third embodiment will be described with reference to Figs. 12 to 14. Fig. 12 is a partially cutaway perspective view of the separation system 1B according to the third embodiment. Fig. 13 is a right side view of the separation system 1B. Fig. 14 is a cross-sectional view of the separation system 1B taken along line A-A in Fig. 13. Regarding the separation system 1B according to the third embodiment, components similar to those of the separation system 1 according to the first embodiment are denoted by the same reference numerals and will not be described.

The separation system 1B according to the third embodiment differs from the separation system 1 according to the first embodiment in that the separation system 1B according to the third embodiment includes a cylindrical body 2B instead of the cylindrical body 2 of the separation system 1 according to the first embodiment.

The cylinder 2B includes a reduced diameter section 28. The reduced diameter section 28 has an inner diameter and an outer diameter that become smaller as it approaches the outlet 24 in the axial direction of the cylinder 2B. The cylinder 2B has a reduced diameter section 28 and a cylindrical section 26 (see FIG. 14) that is upstream of the reduced diameter section 28. The cylindrical section 26 has a constant inner diameter and outer diameter. For example, the cylindrical section 26 is a section that surrounds the motor 4 and the rotating body 3. The reduced diameter section 28 is located outside the inner cylindrical section 5 and surrounds the inner cylindrical section 5 all around.

Like the cylindrical body 2, the cylindrical body 2B has a plurality of discharge holes 25 (44 in the illustrated example). The plurality of discharge holes 25 includes a first group (32 in the illustrated example) of discharge holes 25 located outside the rotor 3, and a second group (12 in the illustrated example) of discharge holes 25 located outside the inner cylindrical portion 5. In the cylindrical body 2B, the cylindrical portion 26 has the first group of discharge holes 25, and the reduced diameter portion 28 has the second group of discharge holes 25.

The separation system 1B according to the third embodiment includes an inner cylinder portion 5, and thus, like the separation system 1 according to the first embodiment, it is possible to improve separation performance while suppressing pressure loss.

In the separation system 1B according to the third embodiment, the separation performance is improved compared to the separation system 1 according to the first embodiment and the separation system 1A according to the second embodiment. The reason for this is presumably that the separation system 1B according to the third embodiment has a reduced diameter portion 28 of the cylinder 2B, so that the volume of the space between the cylinder 2B and the housing 6 outside the inner cylinder portion 5 can be increased, the pressure of the space between the cylinder 2B and the housing 6 can be reduced, and solids contained in the airflow inside the cylinder 2B can be easily discharged from the discharge hole 25 of the cylinder 2B outside the inner cylinder portion 5.

(Embodiment 4)
Hereinafter, a separation system 1C according to embodiment 4 will be described with reference to Fig. 15 and Fig. 16. Fig. 15 is a right side view of the separation system 1C according to embodiment 4. Fig. 16 is a cross-sectional view of the same separation system 1C taken along line A-A in Fig. 15. Regarding the separation system 1C according to embodiment 4, components similar to those of the separation system 1 according to embodiment 1 are denoted by the same reference numerals and will not be described.

The separation system 1C according to the fourth embodiment differs from the separation system 1 according to the first embodiment in that the separation system 1C has a housing 6C instead of the housing 6 of the separation system 1 according to the first embodiment.

The housing 6C is cylindrical in shape, different from the housing 6, and includes an enlarged diameter portion 68.

The inner and outer diameters of the enlarged diameter section 68 increase in the axial direction of the cylinder 2 as they approach the outlet port 24 of the cylinder 2.

The housing 6C has an expanded diameter section 68 and a cylindrical section 67 upstream of the expanded diameter section 68 in the axial direction of the cylindrical body 2. The inner diameter and outer diameter of the cylindrical section 67 are both constant. The inner diameter of the expanded diameter section 68 is the same as the inner diameter of the cylindrical section 67 at the end on the cylindrical section 67 side, and is larger than the inner diameter of the cylindrical section 67 at the end opposite the cylindrical section 67 side. The distance between the cylindrical body 2 and the expanded diameter section 68 in the radial direction of the cylindrical body 2 increases as it approaches the outlet 24 of the cylindrical body 2 in the axial direction of the cylindrical body 2.

The inner and outer diameters of the cylindrical portion 67 are, for example, the same as the inner and outer diameters of the housing 6 of the separation system 1 according to embodiment 1. Therefore, the separation system 1C according to embodiment 4 can increase the volume of the space between the cylinder 2 and the housing 6C outside the inner cylinder portion 5 compared to the separation system 1 according to embodiment 1.

The separation system 1C includes an inner cylinder portion 5. This makes it possible to improve separation performance while suppressing pressure loss, similar to the separation system 1 according to the first embodiment.

(Embodiment 5)
A separation system 1D according to embodiment 5 will be described below with reference to Figs. 17 to 19. Fig. 17 is a partially cutaway perspective view of the separation system 1D according to embodiment 5. Fig. 18 is a right side view of the separation system 1D. Fig. 19 is a cross-sectional view of the separation system 1D taken along line A-A in Fig. 18. Constituent elements of the separation system 1D according to embodiment 5 that are similar to those of the separation system 1 according to embodiment 1 will be denoted by the same reference numerals and will not be described.

The separation system 1D differs from the separation system 1 according to the first embodiment in that it further includes a shutter unit 15 and a fan 16.

The separation system 1D further includes a first duct 13 and a second duct 14. The first duct 13 is disposed upstream of the cylindrical body 2. The second duct 14 is disposed downstream of the cylindrical body 2.

The first duct 13 is cylindrical. The inner diameter of the first duct 13 is constant in the axial direction of the cylindrical body 2 regardless of the distance from the cylindrical body 2. The inner space of the first duct 13 forms a flow path that is connected to the inner space of the cylindrical body 2 on the upstream side of the cylindrical body 2.

The second duct 14 is a rectangular tube whose opening area gradually decreases as it moves away from the cylinder 2 in the axial direction of the cylinder 2. The inner space of the second duct 14 forms a flow path that is connected to the inner space of the cylinder 2 on the downstream side of the cylinder 2.

The shutter unit 15 is a shutter mechanism capable of opening and closing the flow path. The shutter unit 15 has, for example, a shutter body 151, a shaft body 152, and a drive unit 153. The shutter body 151 is disk-shaped and is disposed in the first duct 13. The diameter of the shutter body 151 is substantially the same as the inner diameter of the first duct 13. The shaft body 152 is connected to the shutter body 151. The drive unit 153 rotates the shaft body 152 to rotate the shutter body 151. The drive unit 153 includes, for example, an electrically driven actuator such as a motor.

In the shutter unit 15, the shutter body 151 can rotate between a first position where the thickness direction of the shutter body 151 coincides with the axial direction of the first duct 13, and a second position where the thickness direction of the shutter body 151 coincides with the radial direction of the first duct 13. In the shutter unit 15, when the thickness direction of the shutter body 151 coincides with the axial direction of the first duct 13, the flow path connected to the inner space of the cylinder 2 can be blocked.

In the separation system 1 according to the first embodiment, immediately after the motor 4 is started, until the rotation speed of the motor 4 reaches a predetermined rotation speed, sufficient centrifugal force is not applied to solids such as dust, so the force acting on the solids is dominated by the axial force of the cylinder 2 rather than the radial outward force of the cylinder 2. Therefore, solids may flow out from the outlet 24 without being separated from the main flow from the inlet 23 of the cylinder 2 toward the outlet 24.

In contrast, in the separation system 1D according to the fifth embodiment, for example, the flow path is blocked by the shutter unit 15 until the rotation speed of the motor 4 reaches a predetermined rotation speed after the motor 4 is started. This makes it possible to prevent solids contained in the gas and solids adhering to the inner surface 27 of the cylinder 2, etc., from flowing out from the outlet 24. In addition, in the separation system 1D, it is possible to prevent an increase in humidity in the internal space of the structure (facility) when the humidity of the air flowing into the cylinder 2 is high, etc.

The fan 16 is provided, for example, to control the amount of air passing through the inner space of the cylinder 2.

The separation system 1 according to the first embodiment is designed to apply centrifugal force to solids, so the force that sends air in the axial direction may be relatively weak. As a result, the amount of air (air volume) flowing into the internal space of the structure may be less than the required amount.

In contrast, the separation system 1D according to embodiment 5 is equipped with a fan 16, and is therefore capable of generating a predetermined amount of air.

In the separation system 1D according to the fifth embodiment, the fan 16 is disposed downstream of the outlet 24 of the cylinder 2, making it easier to detect and control the flow rate of the gas flowing into the internal space of the structure. Furthermore, adhesion of dust and the like to the fan 16 is suppressed.

In the separation system 1D, a fan 16 is disposed downstream of the cylinder 2, so that the flow rate (air volume) of the gas passing through the cylinder 2 can be adjusted by the fan 16.

The separation system 1D according to the fifth embodiment includes an inner cylindrical portion 5, and thus, like the separation system 1 according to the first embodiment, it is possible to improve separation performance while suppressing pressure loss.

In the separation system 1D according to the fifth embodiment, by reducing the air volume of the fan 16, it is possible to prevent solids once guided to the outside of the inner cylinder 5 from being pulled by an increase in the axial flow velocity inside the inner cylinder 5. Conversely, in the separation system 1D, the air volume of the fan 16 is adjusted so that solids once guided to the space S1 outside the inner cylinder 5 are not drawn into the air flow F1 inside the inner cylinder 5, thereby improving the separation performance. In the separation system 1D, the axial flow velocity of the cylinder 2 can be slowed by reducing the air volume of the fan 16. This improves the separation efficiency.

(Modification of the embodiment)
The first to fifth embodiments are merely examples of the present disclosure. Various modifications of the first to fifth embodiments are possible depending on the design and the like as long as the object of the present disclosure can be achieved.

The discharge hole 25 of the cylinder 2 is not limited to an arc shape. For example, it may be a long slit shape in a direction parallel to the central axis A2 of the cylinder 2, or a thin slit shape in a direction inclined relative to the direction parallel to the central axis A2. The discharge hole 25 may be circular or polygonal. The discharge hole 25 may be formed from the first end 21 to the second end 22 of the cylinder 2, or may be formed from the center of the cylinder 2 to the second end 22 in the direction along the central axis A2 of the cylinder 2.

The number of discharge holes 25 in the cylindrical body 2 is not limited to multiple, and may be, for example, one.

In addition, the shapes of the multiple discharge holes 25 do not necessarily have to be the same, but may be different.

The material of the cylindrical body 2 is not limited to synthetic resin such as ABS, but may be metal, etc. The material of the rotating body 3 is not limited to synthetic resin such as polycarbonate resin, but may be metal, etc. If the material of the rotating body 3 is metal, the rotating body 3 has electrical conductivity. If the material of the rotating body 3 is synthetic resin, for example, the rotating body 3 may have water repellency.

The downstream end 52 of the inner cylinder 5 may be located downstream of the outlet 24 of the cylinder 2. The inner cylinder 5 is not limited to being a completely closed cylinder when viewed in the axial direction of the cylinder 2, but may be a partially cut cylinder, for example, C-shaped.

Each of the multiple blades 36 may be formed as a separate member from the rotor body 30 and connected to the rotor body 30 by being fixed to the rotor body 30.

In addition, the tip 362 of each of the multiple blades 36 on the side of the tube 2 in the direction of protrusion from the rotor main body 30 may be located forward in the rotation direction R1 of the rotor 3 relative to the base end 361 on the side of the rotor 3.

In addition, each of the multiple blades 36 may have a shape that includes one or more curved portions, such as arcs.

In addition, each of the multiple blades 36 may be formed in a spiral shape around the central axis of rotation A3 of the rotor main body 30. In this case, "spiral" is not limited to a spiral shape with one or more revolutions, but also includes a partial shape of a spiral shape with one revolution.

The rotor 3 may also have a rotor body 30 and a plurality of blades 36 by combining a plurality of rotating members arranged in a direction along the central axis A2 of the cylindrical body 2, each of which constitutes a part of the rotor body 30 and a part of each of the plurality of blades.

The separation systems 1, 1A, 1B, 1C, and 1D may also include multiple exhaust ducts 9. The multiple exhaust ducts 9 may be arranged in a line in the outer circumferential direction of the housing 6. The multiple exhaust ducts 9 may be located at different positions from each other in the axial direction of the housing 6.

Motor 4 is not limited to being disposed on the inlet 23 side as viewed from rotor 3 in the axial direction of cylinder 2, but may be disposed on the outlet 24 side, for example.

In addition, in the separation systems 1A, 1B, 1C, and 1D according to the second to fifth embodiments, the motor 4 is disposed inside the cylindrical body 2 in order to rotate the rotor 3. However, this is not limiting, and for example, the motor 4 may be disposed outside the cylindrical body 2, and the rotation of the rotating shaft of the motor 4 may be transmitted via a pulley and a rotating belt.

In addition, any one of the separation systems 1A, 1B, and 1C according to embodiments 2 to 4 may be equipped with at least one of the shutter unit 15 and the fan 16 in the separation system 1D according to embodiment 5.

The shutter unit 15 may be provided not only in the flow path upstream of the cylindrical body 2, but also in the flow path downstream. The shutter unit 15 may be provided inside the cylindrical body 2.

Furthermore, the fan 16 is not limited to being located downstream of the outlet 24 of the cylinder 2, but may be located, for example, upstream of the inlet 23 of the cylinder 2. In this case, a pre-swirl is imparted to the solids flowing into the cylinder 2, making it easier for the solids to separate. This improves the dust removal efficiency.

The fan 16 may also be provided inside the cylindrical body 2.

In addition, the gas flowing into the cylindrical body 2 from the inlet 23 of the cylindrical body 2 is not limited to air, but may be, for example, exhaust gas, etc.

(Aspects)
The present specification discloses the following aspects.

The separation system (1, 1A, 1B, 1C, 1D) according to the first aspect includes a cylindrical body (2, 2B) and a rotating body (3). The cylindrical body (2, 2B) has a gas inlet (23) at a first end (21), a gas outlet (24) at a second end (22), and a plurality of exhaust holes (25) penetrating in a direction intersecting the axial direction between the first end (21) and the second end (22). The rotating body (3) is disposed inside the cylindrical body (2, 2B) and can rotate around a rotation center axis (A3) along the axial direction of the cylindrical body (2, 2B). The rotating body (3) has a blade (36) that generates a swirling airflow (F0) in the cylindrical body (2, 2B) when the rotating body (3) rotates. The cylindrical body (2, 2B) is longer than the rotating body (3) in the axial direction of the cylindrical body (2, 2B). The separation system (1, 1A, 1B, 1C, 1D) further includes a cylindrical inner tube portion (5, 5A). The inner tube portion (5, 5A) is located inside the tube body (2, 2B) between the rotor (3) and the outlet (24) in the axial direction of the tube body (2, 2B). The inner space of the inner tube portion (5, 5A) is connected to the inner space of the tube body (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the first aspect makes it possible to improve separation performance while suppressing pressure loss.

The separation system (1, 1A, 1B, 1C, 1D) according to the second aspect is the first aspect, and further includes a housing (6, 6C). The housing (6, 6C) is disposed outside the cylindrical body (2, 2B) and houses the cylindrical body (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the second aspect can prevent solids discharged from the discharge hole (25) of the cylindrical body (2, 2B) from scattering.

The separation system (1, 1A, 1B, 1C, 1D) according to the third aspect is the second aspect, and further includes an exhaust duct (9). The exhaust duct (9) is connected to the housing (6, 6C) on the outside of the inner cylinder portion (5, 5A). The inner space of the exhaust duct (9) is connected to the space between the housing (6, 6C) and the cylinder (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the third aspect makes it easier for solids discharged from the discharge hole (25) of the cylindrical body (2, 2B) to be discharged through the exhaust duct (9).

The separation system (1, 1A, 1B, 1C, 1D) according to the fourth aspect is any one of the first to third aspects and has a space (S1) formed between the inner cylinder portion (5, 5A) and the cylinder body (2, 2B) and connected to the discharge hole (25).

In the separation system (1, 1A, 1B, 1C, 1D) according to the fourth aspect, the space (S1) can also function as a reservoir where solids remain.

In the separation system (1, 1A, 1B, 1C, 1D) according to the fifth aspect, in any one of the first to fourth aspects, there is a cavity (10) inside the inner cylinder portion (5, 5A).

The separation system (1, 1A, 1B, 1C, 1D) according to the fifth aspect can suppress pressure loss.

In the separation system (1, 1A, 1B, 1C, 1D) according to the sixth aspect, in any one of the first to fifth aspects, the multiple discharge holes (25) are arranged in the circumferential direction of the cylindrical body (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the sixth aspect can improve separation performance.

In the seventh aspect of the separation system (1A), in any one of the first to sixth aspects, the inner cylindrical portion (5, 5A) includes an expanded diameter portion (53A) whose inner and outer diameters increase toward the outlet (24) in the axial direction of the cylindrical body (2, 2B).

The separation system (1A) according to the seventh aspect can improve separation performance.

In the separation system (1A) according to the eighth aspect, in the seventh aspect, the rotor (3) has a rotor body (30) to which the base end (361) of the blade (36) is connected. The inner cylindrical portion (5A) has an upstream end (51A) on the rotor (3) side and a downstream end (52A) on the outlet (24) side. The upstream end (51A) is located between the tip edge of the blade (36) and the rotor body (30) when viewed from the axial direction of the cylindrical body (2, 2B).

The separation system (1A) according to the eighth aspect can improve separation performance.

In the separation system (1B) according to the ninth aspect, in any one of the first to eighth aspects, the cylindrical body (2B) includes a tapered portion (28) whose inner and outer diameters become smaller as it approaches the outlet (24) in the axial direction of the cylindrical body (2B).

The separation system (1B) according to the ninth aspect can improve separation performance.

In the separation system (1, 1A, 1B, 1C, 1D) according to the tenth aspect, in any one of the first to ninth aspects, at least a part of the rotating body (3), the cylindrical body (2, 2B), and the inner cylindrical portion (5, 5A) is water repellent or conductive.

The separation system (1, 1A, 1B, 1C, 1D) according to the tenth aspect can suppress adhesion of solids due to static electricity, for example, when the ambient humidity is high or when a gas containing moisture containing solids such as moisture-containing dust flows in, if at least a portion of the rotating body (3), the cylindrical body (2, 2B), and the inner cylindrical portion (5, 5A) is water-repellent. The separation system (1, 1A, 1B, 1C, 1D) according to the tenth aspect can suppress adhesion of solids due to static electricity, if at least a portion of the rotating body (3), the cylindrical body (2, 2B), and the inner cylindrical portion (5, 5A) is conductive.

The separation system (1, 1A, 1B, 1C, 1D) according to the eleventh aspect is any one of the first to tenth aspects, and further includes a motor (4). The motor (4) rotates the rotating body (3).

The separation system (1, 1A, 1B, 1C, 1D) according to the eleventh aspect eliminates the need for a separate motor (4).

In the separation system (1, 1A, 1B, 1C, 1D) according to the twelfth aspect, in the eleventh aspect, the motor (4) is arranged on the inlet (23) side as viewed from the rotor (3) in the axial direction of the cylindrical body (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the twelfth aspect can reduce pressure loss compared to a case in which the motor (4) is disposed inside the inner cylinder portion (5, 5A) on the outlet (24) side. In addition, an increase in flow rate can be suppressed, improving separation performance.

The separation system (1, 1A, 1B, 1C, 1D) according to the thirteenth aspect is any one of the first to twelfth aspects, and further includes a shutter section (15). The shutter section (15) is capable of blocking the flow path connected to the inner space of the cylindrical body (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the thirteenth aspect can suppress solids in the gas from flowing out of the outlet (24) of the cylindrical body (2, 2B) immediately after starting the motor (4) that rotates the rotor (3), for example.

The separation system (1, 1A, 1B, 1C, 1D) according to the 14th aspect is any one of the first to 13th aspects, and further includes a fan (16). The fan (16) controls the amount of air passing through the inner space of the cylinder (2, 2B).

The separation system (1, 1A, 1B, 1C, 1D) according to the fourteenth aspect can prevent solids once guided to the outside of the inner tube portion (5, 5A) from being pulled by an increase in the axial flow velocity inside the inner tube portion (5, 5A).

The configurations according to the second to fourteenth aspects are not essential components of the separation system (1, 1A, 1B, 1C, 1D) and may be omitted as appropriate.

A separation system (1, 1A, 1B, 1C, 1D) according to a fifteenth aspect includes a cylindrical body (2, 2B) and an inner cylindrical portion (5, 5A). The cylindrical body (2, 2B) has a gas inlet (23) at a first end (21), a gas outlet (24) at a second end (22), and a discharge hole (25) penetrating in a direction intersecting the axial direction between the first end (21) and the second end (22). The inner cylindrical portion (5, 5A) is disposed inside the cylindrical body (2, 2B) and is shorter than the cylindrical body (2, 2B) in the axial direction of the cylindrical body (2). The separation system (1, 1A, 1B, 1C, 1D) separates the swirling airflow (F0) that flows in from the inlet (23) of the cylinder (2, 2B) into a first airflow (F1) that passes inside the inner cylinder (5, 5A) and a second airflow (F2) that passes outside the inner cylinder (5, 5A), and discharges the second airflow (F2) from the discharge hole (25).

The separation system (1, 1A, 1B, 1C, 1D) according to the fifteenth aspect makes it possible to improve separation performance while suppressing pressure loss.

1, 1A, 1B, 1C, 1D Separation system 10 Cavity 11 First cover 12 Second cover 13 First duct 14 Second duct 15 Shutter section 16 Fan 111 First frame section 112 First mounting section 113 First beam section 114, 115, 124, 125 Groove 121 Second frame section 122 Second mounting section 123 Second beam section 151 Shutter body 152 Shaft body 153 Drive section 2, 2B Cylinder 21 First end 22 Second end 23 Inlet 24 Outlet 25 Discharge hole 26 Cylindrical section 27 Inner circumferential surface 28 Reduced diameter section 3 Rotating body 30 Rotating body main body 31 First end 32 Second end 36 Blade 361 Base end 362 Tip 37, 66 Outer circumferential surface 4 Motor 41 Motor body 42 Rotating shaft 5, 5A Inner cylinder portion 51, 51A Upstream end 52, 52A Downstream end 53A, 68 Enlarged diameter portion 6, 6C Housing 61 First end 62 Second end 67 Cylindrical portion 71 First end 72 Second end 8 Bearing A2 Central axis A3 Rotation central axis F0 Air flow F1 First air flow F2 Second air flow R1 Rotation direction S1 Space

Claims (13)

a cylinder having a gas inlet at a first end, a gas outlet at a second end, and a discharge hole penetrating in a direction intersecting an axial direction between the first end and the second end;
a rotor that is disposed inside the cylindrical body and is rotatable about a rotation center axis along the axial direction of the cylindrical body,
the rotor has blades that generate a swirling airflow within the cylinder when the rotor rotates,
the cylindrical body is longer than the rotor in the axial direction,
The rotor is located between the rotor and the outlet in the axial direction inside the cylindrical body, and the inner space of the cylindrical body is connected to the inner space of the cylindrical body .
Further comprising a housing disposed outside the cylindrical body and housing the cylindrical body,
The exhaust duct is connected to the housing on the outside of the inner cylindrical portion, and an inner space of the exhaust duct is connected to a space between the housing and the cylindrical body.
Separation system. A space is formed between the inner cylindrical portion and the cylindrical body and is connected to the discharge hole.
The separation system of claim 1 . There is a cavity inside the inner cylindrical portion.
A separation system according to any one of claims 1 and 2 . The cylindrical body has a plurality of the discharge holes,
The plurality of discharge holes are arranged in a circumferential direction of the cylindrical body.
A separation system according to any one of claims 1 to 3 . The inner cylindrical portion includes an expanding portion having an inner diameter and an outer diameter that increase toward the outlet in the axial direction.
A separation system according to any one of claims 1 to 4 . The rotor has a rotor main body to which the base ends of the blades are connected,
the inner cylindrical portion has an upstream end on the rotor side and a downstream end on the outlet side,
The upstream end is located between a tip edge of the blade and the rotor body when viewed in the axial direction.
The separation system of claim 5 . The cylindrical body includes a tapered portion having an inner diameter and an outer diameter that become smaller toward the outlet in the axial direction.
A separation system according to any one of claims 1 to 6 . The separation system according to claim 1 , wherein at least a portion of the rotating body, the cylindrical body, and the inner cylindrical portion is water-repellent or conductive. Further comprising a motor for rotating the rotating body.
A separation system according to any one of claims 1 to 8 . The separation system according to claim 9 , wherein the motor is disposed on the inlet side as viewed from the rotor in the axial direction. The separation system according to claim 1 , further comprising a shutter portion capable of blocking a flow path connected to the internal space of the cylindrical body. Further comprising a fan for controlling the amount of air passing through the inner space of the cylindrical body.
A separation system according to any one of claims 1 to 11 . an inner cylindrical portion disposed inside the cylindrical body and shorter than the cylindrical body in the axial direction;
The airflow that flows in through the inlet of the cylinder and is swirling is divided into a first airflow that passes through the inside of the inner cylinder portion and a second airflow that passes through the outside of the inner cylinder portion, and the second airflow is discharged from the exhaust hole.
The separation system of claim 1 .

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