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WO2015194529A1 - Dispositif de classification de poudre du type à cyclone - Google Patents

Dispositif de classification de poudre du type à cyclone Download PDF

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Publication number
WO2015194529A1
WO2015194529A1 PCT/JP2015/067254 JP2015067254W WO2015194529A1 WO 2015194529 A1 WO2015194529 A1 WO 2015194529A1 JP 2015067254 W JP2015067254 W JP 2015067254W WO 2015194529 A1 WO2015194529 A1 WO 2015194529A1
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WO
WIPO (PCT)
Prior art keywords
flow
cylindrical collector
powder
air flow
swirling
Prior art date
Application number
PCT/JP2015/067254
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English (en)
Japanese (ja)
Inventor
輝男 忍足
一己 山本
吉田　英人
Original Assignee
綜研化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 綜研化学株式会社 filed Critical 綜研化学株式会社
Priority to JP2016529353A priority Critical patent/JP6533522B2/ja
Publication of WO2015194529A1 publication Critical patent/WO2015194529A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B04C5/04—Tangential inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force

Definitions

  • the present invention relates to a cyclone type powder classifier using centrifugal force.
  • a cyclone type powder classifier as shown in FIG. 20 is known as a cyclone type powder classifier for classifying powder distributed in a predetermined particle size range into coarse powder and fine powder (for example, patents). Reference 1).
  • an air flow containing, for example, dry dispersed powder is passed along the inner wall surface from the opening 2a of the inflow pipe 2 in the upper part of the substantially upright cylindrical cyclone tower 3.
  • a swirl flow R is formed in the centrifugal separation chamber 4 in the cyclone tower 3 by blowing an air flow in the horizontal direction, and the coarse powder having a large volume among the powder contained in the swirl flow R is converted into the swirl flow. Since it gradually settles on board, it is collected by a collector 10 provided at the lower part of the cyclone tower 3.
  • fine powder having a small volume is discharged from an outflow pipe 8 disposed above the center of the swirling flow of the cyclone tower 3. The configuration is such that it is extracted upward and collected.
  • a powder having a particle size of 5 ⁇ m to 30 ⁇ m is required from a powder composed of fine particles of less than 5 ⁇ m, intermediate particles of 5 ⁇ m to 30 ⁇ m, and coarse particles of 30 ⁇ m or more.
  • particles having a particle diameter of less than 5 ⁇ m are removed by extracting an air stream containing fine particles upward from the outflow pipe 8 (in this specification, “particle diameter” (The equivalent volume diameter.)
  • particle diameter The equivalent volume diameter.
  • the present invention further removes coarse particles from a coarse powder containing intermediate particles collected in a centrifuge chamber in a secondary classification chamber provided at a collection site, and has a desired particle size.
  • An object of the present invention is to provide a cyclone type powder classifier capable of separating powders.
  • a cyclone type powder classifier comprises a cylindrical upper peripheral wall 42, a body leg 52 connected to the lower part of the upper peripheral wall 42, A first cylindrical collector 39 at the lower part of a substantially cylindrical cyclone tower 38 having a divergent taper part 53 connected to the lower part of the body leg part 52; While supplying the powder having a particle size distribution through the inflow pipe 40 into the centrifuge chamber 46 formed between the upper peripheral wall 42 and the body leg 52, A swirling flow R is formed in the centrifuge chamber 46 by sucking or discharging the air in the centrifuge chamber 46 via an outflow pipe 48 that is located above the centrifuge chamber 46 and communicates with the outside.
  • the second cylindrical shape is disposed between the tapered portion 53 and the first cylindrical collector 39, the upper end is opened, and the fine particles separated from the lower end opening are passed through the passage 55a. It has a structure for taking out from the collector 55, and has an inclined surface 55 b disposed so as to face the inclined surface 53 a of the tapered portion 53 so as to form a flow path.
  • a second cylindrical collector 55 having a tapered upper part, which forms an inter-partition inclined passage 56 between the inclined surface 53a and the inclined surface 55b of the second cylindrical collector 55;
  • An additional air flow introduction pipe 57 that is connected to the side wall portion of the first cylindrical collector 39 or the side wall portion of the tapered portion 53 and introduces an additional air flow S into the centrifugal separation chamber 46,
  • the coarse powder guided downward along with the swirl flow R in the centrifugal separation chamber 46 is guided from the lower end opening of the body leg 52 to the inclined passage 56 between the partitions, Due to the additional air flow S introduced into the centrifugal separation chamber 46 from the additional air flow introduction pipe 57, the intermediate particles m not more than a predetermined weight contained in the coarse powder are moved from the outer peripheral side of the swirling flow R to the inner peripheral direction.
  • the intermediate particles m having a predetermined weight or less are guided inward through the upper end opening 55d of the second cylindrical collector 55, whereby the intermediate particles m having the predetermined weight or less are guided to the first weight. It is characterized by being separated from the lower end opening 55c of the second cylindrical collector 55.
  • the tapered surface 53a formed between the inclined surface 53a of the taper portion 53 that widens at the end and the inclined surface 55b of the second cylindrical collector 55 whose upper portion is tapered is formed.
  • the flow of the additional air flow S can be generated in the inter-partition wall slant passage 56, and the flow of the additional air flow S generated in the inter-partition wall slant passage 56 causes the space between the partition walls from the vicinity of the lower end opening of the trunk leg 52.
  • the intermediate particles m having a predetermined weight or less can be swung up again.
  • the weight of the powder is proportional to the volume of the particle size, so that a small particle size means lighter than a large particle size. .
  • the intermediate particles m having a small particle size are caused to rise upward again in the inter-partition inclined passage 56, whereby the intermediate particles m are secondly collected by the second cylindrical collector 55.
  • the upper end opening 55d is guided to the upper end opening 55d, dropped into the inside from the upper end opening 55d, and can be recovered from the lower end opening 55c via the second cylindrical collector 55. Therefore, intermediate particles m (for example, 5 ⁇ m to 30 ⁇ m) having a uniform particle size can be separated.
  • fine particles for example, less than 5 ⁇ m
  • coarse particles M for example, 30 ⁇ m or more
  • a spiral guide vane 47 may be arranged inside the cyclone tower 38, and a swirl flow may be formed in the centrifugal separation chamber 46 by the guide vane 47.
  • a plurality of the additional air flow introduction pipes 57 are formed at predetermined intervals in the circumferential direction.
  • the additional air flow introduction pipe 57 is preferably connected so as to have a flow inward from the outer peripheral portion of the swirl flow R.
  • the additional air flow introduction pipe 57 is connected in the tangential direction of the first collector 39 or the divergent taper portion 53 so as to increase the swirl speed of the swirl flow R. It is preferable.
  • the additional airflow S can increase the swirling speed of the swirling flow R.
  • the additional airflow introduction pipe 57 is connected or the outer periphery of the tapered portion 53 to which the additional air flow introduction pipe 57 is connected.
  • the swirl direction of the swirl flow U formed from the additional air flow S introduced from the additional air flow introduction pipe 57 is formed in the centrifugal chamber 46 from the bottom to the top.
  • the introduction direction of the additional airflow S is set so as to be the same direction as the swirling direction of the swirling flow R going downward from the bottom, and at the lower outlet of the inter-partitioned inclined passage 56, It is preferable that the swirl speed of the swirl flow R ⁇ the swirl speed of the swirl flow U can be set.
  • the swirling flow U accelerates the swirling flow R, whereby the classification accuracy can be improved.
  • the inflow pipe 40 communicates with the centrifuge chamber 46 through an opening 43 formed in the upper peripheral wall 42 of the centrifuge chamber 46 and is tangent to the centrifuge chamber 46. It is preferable to be connected in the direction.
  • a plurality of air intake holes 62 a for introducing outside air into the centrifuge chamber 46 are formed in the upper peripheral wall 42 or the trunk leg portion 52 of the centrifuge chamber 46.
  • the air intake nozzle 62 b is used to introduce the outside air into the peripheral wall 42 or the trunk leg 52 of the centrifugal separation chamber 46, and the swirling flow R flows into the peripheral wall 42 or the trunk leg 52 of the centrifugal separation chamber 46. It is preferable that it is connected to the tangential direction in the direction along.
  • a straight line in the vertical direction is extended from the inner peripheral wall of the lower end opening of the body leg 52 toward the inclined surface 55b of the second cylindrical collector 55, and the straight line and the inclined surface
  • the position intersecting with 55b is defined as E
  • the length extending from the position E to the outside of the inclined surface 55b is x (however, when the straight line and the inclined surface 55b do not intersect, the length of the inclined surface 55b
  • the length of the inclined surface 53a of the tapered portion 53 of the first cylindrical collector 39 is y
  • the length is x
  • 0.05y ⁇ x ⁇ y It is preferable to set to.
  • the ratio of the radius r 2 of the upper end opening portion of the radius r 1 of the lower end opening of the body leg 52 and the second cylindrical collector 55 (r 2 / r 1) is 0 ⁇ r It is preferable that 2 / r 1 ⁇ 1.30.
  • the powder classification method of the present invention uses the above apparatus,
  • the swirl direction R of the swirl flow U from the bottom to the top formed by the additional air stream S introduced from the additional air stream introduction pipe 57 is formed in the centrifugal separation chamber 46, and the swirl flow R from the top to the bottom.
  • the additional airflow S is introduced so as to be in the same direction as the swirling direction, and at the lower outlet of the inter-partition wall inclined passage 56,
  • the swirl speed of the swirl flow R is smaller than the swirl speed of the swirl flow U.
  • the swirling flow U accelerates the swirling flow R, whereby the classification accuracy can be further improved.
  • the difference in the magnitude of the centrifugal force applied to the particles generated by the swirling flow in the cyclone tower, and the upper swirling flow and the swirling flow flow inward from the outer peripheral side.
  • the second cylindrical collection in which intermediate particles are provided inside the collector of the powder having a particle size distribution accumulated on the lower side of the cyclone tower by combining the drag of the additional airflow and the centrifugal force.
  • the coarse particles are dropped into the first cylindrical collector and separated from the powder having a particle size distribution accumulated on the lower side of the cyclone tower.
  • the classification performance in the cyclone tower can be improved.
  • the cyclone type powder classifier according to the present invention has an effect that it is excellent in maintenance because there are few drive units.
  • FIG. 1 is a schematic configuration diagram of a cyclone type powder classification apparatus according to an embodiment of the present invention.
  • FIG. 2 is a schematic sectional view of the cyclone tower shown in FIG. 3 is an enlarged cross-sectional view of a main part showing the vicinity of an inclined passage between partition walls of the cyclone type powder classifier shown in FIG. 4 (a) and 4 (b) are cross-sectional views of main parts when air intake holes or nozzles are provided in a ring-shaped member of a cyclone type powder classifier according to another embodiment of the present invention.
  • 5 (a) and 5 (b) are schematic cross-sectional views of the ring-shaped member employed in the embodiment shown in FIGS. 4 (a) and 4 (b).
  • FIG. 6 is a cross-sectional view of the vicinity of the inflow pipe of the cyclone type powder classifier shown in FIG.
  • FIG. 7 is a schematic view showing the positional relationship of the second cylindrical collector of the cyclone type powder classifier shown in FIG.
  • FIG. 8 shows the experimental results
  • FIG. 8 (a) shows the frequency distribution of the raw materials
  • FIG. 8 (b) shows the frequency distribution classified by the experiment
  • FIG. 8 (c) shows the cyclone type powder. It is explanatory drawing which showed the material balance when the raw material obtained with the whole classification apparatus is set to 100.
  • FIG. FIG. 9 is a schematic configuration diagram of a cyclone type powder classifier according to still another embodiment of the present invention.
  • FIG. 9 is a schematic configuration diagram of a cyclone type powder classifier according to still another embodiment of the present invention.
  • FIG. 10A shows the partition wall of the cyclone type powder classifier when the additional air flow introduction pipe is connected in the tangential direction of the first collector so as to increase the swirling speed of the swirling flow in the centrifuge chamber.
  • FIG. 10 (b) is a schematic top view of FIG. 10 (a).
  • FIG. 11A is a schematic cross-sectional view showing the vicinity of the inclined passage between the partitions of the cyclone type powder classifier when an additional airflow storage chamber is provided on the outer periphery of the first cylindrical collector
  • FIG. FIG. 12 is a schematic top view of FIG.
  • FIG. 12 is a diagram showing the frequency distribution of the raw material Y used in Examples 2-22.
  • FIG. 13 shows the experimental results, and is a diagram showing the relationship between the particle size as the classification result and the partial separation efficiency.
  • FIG. 14 shows the experimental results, and is a diagram showing the relationship between the particle size as the classification result and the partial separation efficiency.
  • FIG. 15 shows the experimental results and shows the relationship between the particle size and the partial separation efficiency, which is the classification result.
  • FIG. 16 shows the experimental results, and is a diagram showing the relationship between the particle size as the classification result and the partial separation efficiency.
  • FIG. 17 shows the experimental results and is a diagram showing the relationship between the flow rate of the additional airflow and the classification accuracy index.
  • FIG. 18 is a diagram showing the radius r 1 of the lower end opening of the trunk leg and the radius r 2 of the upper end opening of the second cylindrical collector.
  • FIG. 19 shows the experimental results, the ratio of the radius r 1 of the lower end opening of the body legs and the radius r 2 of the upper end opening portion of the second cylindrical collector 55 (r 2 / r 1) It is a figure which shows the relationship between and a classification point.
  • FIG. 20 is a schematic view showing the behavior of a conventional cyclone type powder classifier.
  • FIG. 1 is a schematic configuration diagram of a cyclone type powder classifier 30 according to an embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional view of the cyclone tower 38 shown in FIG.
  • the cyclone type powder classifier 30 has a cylindrical cyclone tower 38 whose apex is directed in the vertical direction.
  • the cylindrical cyclone tower 38 includes an upper peripheral wall 42, a tapered body leg portion 52 connected to the lower portion of the upper peripheral wall 42, and a taper portion 53 having a divergent width connected to the lower portion of the body leg portion 52. Yes. A main portion of the centrifuge chamber 46 surrounded by the upper peripheral wall 42 and the body leg portion 52 is formed in the upper portion of the cyclone tower 38.
  • drum leg part 52 is not limited to tapering, You may be formed in the substantially straight trunk
  • a first cylindrical collector 39 is provided at the lower part of the cyclone tower 38.
  • a second cylindrical collector 55 is accommodated which is formed with the upper portion being tapered and bent.
  • the first cylindrical collector 39 is formed with an upper end and a lower end opened, and has a lower end opening 39a communicating with another container or the like at the lower end.
  • a valve 64 is provided above the lower end opening 39a.
  • the second cylindrical collector 55 formed by bending has an upper end and a lower end opened, and has an upper end opening 55d and a lower end opening 55c, and these openings are S-shaped. Are connected by a channel-like passage 55a.
  • a valve 66 is provided above the lower end opening 55c of the S-shaped passage 55a.
  • the second cylindrical collector 55 constitutes a main part of the present invention.
  • the second cylindrical collector 55 is classified by the outflow pipe 48, and further intermediates the powder toward the secondary separation chamber provided at the lower portion of the centrifugal separation chamber 46. Used to classify particles and coarse particles.
  • the 2nd cylindrical collector 55 is arrange
  • the mechanism for adjusting the position of the second cylindrical collector 55 in the vertical direction is not particularly limited.
  • a cross shaft gear is used as the positional relationship of the gear shaft, and a bevel gear is used as the type of gear.
  • a transmission mechanism using gears can be used.
  • a misaligned shaft gear or the like can be used as the positional relationship of the gear shaft, and a spiral bevel gear, a hypoid gear, a cylindrical worm gear, or the like can be used as the type of gear.
  • the second cylindrical collector 55 has an inclined surface 55b disposed substantially parallel to the inclined surface 53a of the divergent taper portion 53 at the upper portion, and the inclined surface 53a of the divergent taper portion 53 and the second surface. Between the inclined surfaces 55b of the cylindrical collector 55, an inter-partition inclined passage 56 is formed.
  • the bent second cylindrical collector 55 in the present embodiment is formed as described above. Further, since the second cylindrical collector 55 is movable in the vertical direction, if the second cylindrical collector 55 is moved upward to bring the inclined surface 53b closer to the inclined surface 53a. The passage width of the inter-partition inclined passage 56 is narrowed. On the other hand, if the second cylindrical collector 55 is moved downward and the inclined surface 55b is arranged so as to be far from the inclined surface 53a, the passage width of the inter-partition inclined passage 56 can be increased. Thereby, the flow volume of the airflow etc. which flow here can be adjusted. Further, it is possible to accumulate more coarse particles in the first cylindrical collector 39 by increasing the width.
  • an additional air flow introduction pipe 57 for introducing the additional air flow S into the centrifugal separation chamber 46 is connected to the side wall portion of the first cylindrical collector 39.
  • the additional air flow introduction pipe 57 can also be connected to the side wall of the taper portion 53 that widens toward the end. It is preferable that a plurality of additional air flow introduction pipes 57 are formed at predetermined intervals in the circumferential direction.
  • the additional air flow introduction pipe 57 introduces external air as an additional air flow S into the centrifugal separation chamber 46 via the air compressor 63 and the flow meter 65, and the additional air flow S introduced from the additional air flow introduction pipe 57. As a result, a new air flow is generated in the centrifugal separation chamber 46.
  • the additional airflow S from the additional airflow introduction pipe 57 is connected so as to flow inwardly from the outer peripheral side of the swirling flow R as shown by a dotted line in FIG.
  • the outflow pipe 48 is disposed on the central axis of the centrifugal separation chamber 46.
  • the outflow pipe 48 extends downward to a position lower than the height of the inflow pipe 40 for supplying the powder into the centrifuge chamber 46, and the lower end of the outflow pipe 48 is opened into the cyclone tower 38 to be centrifuge chamber 46.
  • the upper end of the outflow pipe 48 extends outward from the upper part of the cyclone tower 38 to form a discharge port 50 for air and fine powder.
  • a fine powder collecting unit 51 made of a bag filter or the like is connected to the air of the outflow pipe 48 and the fine powder outlet 50, and a suction blower 54 is further connected.
  • the suction blower 54 sucks the air in the centrifugal separation chamber 46 through the fine powder collecting part 51 and the fine powder discharge port 50. When suction is performed, the inside of the centrifugal separation chamber 46 becomes negative pressure.
  • the powder to be classified stored in a hopper (not shown) is quantitatively supplied by the quantitative supply device 32 and, if necessary, the powder by the dispersion device 36.
  • the body is dispersed in the air, and the dispersed powder-containing air is sucked into the centrifugal chamber 46 of the cyclone tower 38 through the inflow pipe 40 by suction by the suction blower 54.
  • a swirl flow R formed by powder and air is formed inside the centrifugal separation chamber 46.
  • a discharge blower (not shown) upstream of the fixed amount supply device 32 in place of the suction blower 54, a swirl flow R made of powder and air is formed inside the centrifugal separation chamber 46.
  • the cyclone type powder classification apparatus 30 according to an embodiment of the present invention is configured as described above, and the operation thereof will be described below.
  • powder to be classified (for example, powder containing a particle size of 30 ⁇ m or more) stored in a hopper (not shown) is quantitatively discharged by the quantitative supply device 32. If necessary, the powder is dispersed in the air by the dispersing device 36, and the dispersed powder-containing air is sucked by the suction blower 54, and then in the centrifugal chamber 46 of the cyclone tower 38 through the inflow pipe 40. Is flowed into. At this time, since the inflow pipe 40 is disposed in a tangential direction with respect to the centrifuge chamber 46, a swirl flow R composed of powder and air is formed inside the centrifuge chamber 46 as shown in FIG. The Further, by installing a discharge blower (not shown) upstream of the fixed amount supply device 32 in place of the suction blower 54, a swirl flow R made of powder and air is formed inside the centrifugal separation chamber 46. .
  • a discharge blower (not shown) upstream of the fixed amount supply device 32 in place of the suction
  • the powder exposed to the swirl flow R is subjected to a separating action according to the particle size while being dispersed by swirling motion.
  • fine powder having a predetermined particle diameter or less for example, fine powder of less than 5 ⁇ m, is sucked into the outflow pipe 48 from the lower end opening 48a of the outflow pipe 48 opened in the centrifugal separation chamber 46 together with the air flow. 50 through the fine powder collecting unit 51.
  • the powder having a particle diameter of 5 ⁇ m or more is not discharged upward from the fine powder discharge port 50, and gradually increases in the substantially cylindrical cyclone tower 38 as the swirl flow R flows. And is discharged from the lower end opening of the body leg portion 52 formed at the lower end of the cyclone tower 38 toward the taper portion 53 side that widens toward the end. And the powder which falls below with the flow of the swirl
  • a predetermined amount of air is supplied to the additional airflow introduction pipe 57 from the air compressor 63 via the flow meter 65, and the additional airflow S introduced from the additional airflow introduction pipe 57 causes the swirl flow R
  • the additional airflow S is introduced so as to flow from the outer peripheral side to the inner side (see FIG. 2).
  • the coarse particles (for example, 30 ⁇ m or more) M out of the powder falling into the inter-partition inclined passage 56 from the lower end of the trunk leg 52 due to the swirl flow R has a large weight. It is falling with the centrifugal force of fully acting. Therefore, the coarse particles M do not rise even when receiving the flow T that rises due to the additional airflow S, receive the force in the outer circumferential direction indicated by the arrow P in FIG. 3, and collect the first cylindrical collection according to the inertial force. It falls downward along the inner wall surface of the vessel 39. As a result, the coarse particles M fall to the lower end opening 39a side of the first cylindrical collector 39 and are separated from the lower end opening 39a.
  • intermediate particles m are placed in the second cylindrical collector 55, and coarse particles M are placed in the first tube.
  • coarse particles M are placed in the first tube.
  • Each can be separated in the shape collector 39.
  • the powder having a particle size distribution is first separated into a fine powder and a coarse powder containing intermediate particles, and then the coarse particles M can be removed from the coarse powder containing intermediate particles. Become.
  • the air flow is introduced from the inflow pipe 40 and the air in the centrifuge chamber 46 is sucked or discharged by the outflow pipe 48.
  • a spiral guide vane 47 is disposed inside the cyclone tower 38, and the guide vane 47 causes a swirl flow into the centrifugal separation chamber 46. R can also be formed.
  • the present invention is also applicable to an axial flow cyclone.
  • the guide vane 47 shown in FIG. 9 is installed so as not to rotate, the guide vane 47 is not limited to fixed installation, and may be rotated by external power.
  • the trunk leg portion 52 is tapered, but the trunk leg portion 52 is not limited to being tapered, and may be formed in a substantially straight trunk shape or a divergent shape. good.
  • outside air is introduced only from the inflow pipe 40, but outside air can be additionally introduced from other than the inflow pipe 40.
  • a ring-shaped member 60 is installed around the upper peripheral wall 42 or the trunk leg 52 so as to expand the centrifugal chamber 46 inside.
  • a plurality of air intake holes 62 a are formed in the ring-shaped member 60, and thus, outside air may be positively added into the centrifuge chamber 46 from these air intake holes 62 a.
  • the air intake holes 62a formed in the ring-shaped member 60 are preferably formed in the tangential direction of the peripheral wall 61 so as to follow the flow of the swirl flow R as shown in FIG. Further, the air intake holes 62a are not limited to the same diameter, and the opening on the outside air introduction side can be enlarged.
  • the air intake nozzle 62 b is used to introduce the outside air into the peripheral wall 42 or the trunk leg 52 of the centrifugal separation chamber 46. It is preferable that the trunk leg 52 is connected in a tangential direction in a direction along the flow of the swirl flow R.
  • the outside air introduced from the air intake nozzle 62b can increase the speed of the swirl flow R in the centrifugal separation chamber 46, and as a result, the particle classification performance can be improved. . Further, it is preferable that one or a plurality of the nozzles 62b is formed. Furthermore, when outside air is blown into the centrifugal separation chamber 46 in the direction along the flow of the swirl flow R in the direction along the flow of the swirl flow R from the air intake hole 62a or the air intake nozzle 62b, the classification point D p50 is set. Can be small.
  • the additional air flow introduction pipe 57 is connected in the tangential direction of the first collector 39 or the taper portion 53 that widens toward the end, and the centrifuge chamber. It is preferable to be connected so as to increase the swirling speed of 46 swirling flows R.
  • the connection to increase the swirl speed of the swirl flow R means that the swirl direction of the swirl flow U formed by the additional air flow S is the same direction as the swirl direction of the swirl flow R. Is connected.
  • the additional airflow S can increase the swirling speed of the swirling flow R.
  • an additional air flow storage chamber 67 is formed on the outer periphery of the first cylindrical collector 39 to which the additional air flow introduction pipe 57 is connected.
  • the first cylindrical collector 39 may be provided with an airflow discharge hole 68.
  • the additional airflow S can be introduced into the cyclone tower 38.
  • the additional airflow storage chamber 67 is attached so as to surround the airflow discharge hole 68, when the additional airflow S is caused to flow through the additional airflow storage chamber 67, the airflow discharge hole 68. Is added to the inside of the cyclone cylinder 38 or the inside of the first cylindrical collector 39, and the swirl speed of the swirling flow R guided to the inter-partitioned slant passage 56 is divided. Will increase.
  • the additional airflow storage chamber 67 is not limited to the outer periphery of the first cylindrical collector 39, and may be provided in the tapered portion 53 of the body leg portion 52.
  • the swirl direction of the swirling flow U formed from the additional air flow S introduced from the additional air flow introducing pipe 57 from the bottom to the top is formed in the centrifuge chamber 46 from the top to the bottom.
  • the direction of introduction of the additional airflow S is set so as to be the same as the direction of rotation of the swirling flow R toward the airway, and the swirling speed of the swirling flow R ⁇ the swirling speed of the swirling flow U at the lower outlet of the inter-partition inclined passage 56. It is preferable that the setting is possible.
  • the swirl flow U can accelerate the swirl speed of the swirl flow R containing the powder.
  • the inflow pipe 40 communicating with the inside of the centrifuge chamber 46 is a portion communicating with the centrifuge chamber 46 as shown in FIG. 6, and X 1 is preferably narrower than the opening X 0 on the inlet side. .
  • the powder remaining in the cyclone tower 38 can be further classified into intermediate particles m and coarse particles M.
  • a straight line in the vertical direction is formed from the inner peripheral wall of the lower end opening of the body leg 52 toward the inclined surface 55b of the second cylindrical collector 55.
  • E the position where the straight line and the inclined surface 55b cross
  • x is the length of the inclined surface 55b
  • y is the length of the inclined surface 53a of the tapered portion 53 of the first cylindrical collector 39, preferably 0.05y ⁇ x ⁇ y. More preferably, when 0.14y ⁇ x ⁇ y, more preferably 0.54y ⁇ x ⁇ y, the classification accuracy is improved.
  • the swirl flow U formed from the additional air flow S introduced from the additional air flow introduction pipe 57 and directed from the bottom to the top is formed in the centrifugal separation chamber 46 from the top to the bottom.
  • the additional air stream S is introduced so as to be in the same direction as the swirl flow R toward the front, and the swirl speed of the swirl flow R ⁇ the swirl speed of the swirl flow U is classified at the lower outlet of the inter-partitioned inclined passage 56. Can do.
  • the swirl flow U can accelerate the swirl speed of the swirl flow R containing powder.
  • the effect on the particles is increased with an increase in additional airflow.
  • the centrifugal force due to the swirl flow U of the additional airflow is added to the centrifugal force due to the swirling flow R, and the centrifugal force increases with the increase in the drag force of the additional airflow, and the difference between the drag force acting on the particles and the centrifugal force is small. It is considered that the classification accuracy is increased, and the classification accuracy can be remarkably improved without changing the particle size of the classification point so much.
  • the additional air flow S In order to set so that the swirling speed of the swirling flow R ⁇ the swirling speed of the swirling flow U, the additional air flow S, the air flowing into the centrifugal separation chamber 46 via the inflow pipe 40, and the air intake hole 62a. It is preferable to adjust at least one flow rate of the outside air taken in from the air and the outside air taken in from the air intake nozzle 62b.
  • a method for preparing the additional airflow S it is also possible to connect the additional airflow introduction pipe as described above as shown in FIGS. 10A and 10B or FIGS. 11A and 11B. .
  • / R 1 is preferably 0 ⁇ r 2 / r 1 ⁇ 1.30, more preferably 0 ⁇ r 2 / r 1 ⁇ 1.00, and even more preferably 0 ⁇ r 2 / r 1 ⁇ 0.79, Most preferably, when 0 ⁇ r 2 / r 1 ⁇ 0.53, it has been confirmed that the classification point D p50 of the particles to be classified can be reduced.
  • r 2 / r 1 The value of r 2 / r 1 is set to the above range, and the outside air from the air intake hole 62a or the air intake nozzle 62b shown in FIG. Thus, it was confirmed that when the centrifugal separation chamber 46 was blown, the effect of reducing the classification point of the particles to be classified was further enhanced.
  • large coarse particles M can be classified in one cyclone tower 38. As a result, it is possible to classify coarse particles, intermediate particles, and fine particles into three stages.
  • Example 2 the particle diameter was measured by a laser diffraction / scattering method (measurement apparatus: LA-950 manufactured by Horiba, Ltd.).
  • Example 1 [Raw material X] Material: Acrylic resin Average particle size: 22 ⁇ m True density: 1190kg / m 3 The ratio of the particle diameter to the whole particle of 5 ⁇ m to less than 30 ⁇ m: 96.9% Particles over 30 ⁇ m: 3% (0.1% for less than 5 ⁇ m) The frequency distribution of the raw material X is shown in FIG.
  • FIG. 8 (b) shows the frequency distribution of the obtained intermediate particles and coarse particles
  • FIG. 8 (c) shows the material balance.
  • the black circle marker line indicates the frequency distribution on the intermediate particle side
  • the white circle marker line indicates the frequency distribution on the coarse particle side.
  • Example 2 ⁇ Cyclone type powder classifier (configuration shown in FIG. 1)> Diameter of upper cylindrical part of cyclone tower: 72mm Length of upper cylindrical part of cyclone tower: 168mm Radius r 1 of the lower end opening of the trunk leg of the cyclone tower: 19 mm Cyclone tower body leg length: 215mm The length y of the inclined surface of the tapered portion of the first cylindrical collector: 42 mm When a straight line in the vertical direction is extended from the inner peripheral wall of the lower end opening of the trunk leg toward the inclined surface of the second cylindrical collector, and the position where this straight line and the inclined surface intersect is defined as E Length x extending from the position E to the outside of the inclined surface (hereinafter also referred to as “length x”): 6 mm Diameter of lower end opening of cylindrical portion of first cylindrical collector: 35 mm Length of the cylindrical part of the first cylindrical collector: 208 mm Length of inclined surface 55b of the second cylindrical collector: 6 mm Radius r 2 of
  • the procedure was the same as in Example 2 except that.
  • the procedure was the same as in Example 2 except that.
  • Example 8 The same operation as in Example 2 was performed using the same cyclone type powder classifier as in Example 2, except that the length x was 23 mm.
  • FIG. 13 to FIG. 16 show the relationship between the particle size as a classification result and the partial separation efficiency.
  • the partial separation efficiency ⁇ is expressed by the following formula (1), and is the first with respect to the weight of the particle diameter in the range of D p ⁇ 1 / 2 ⁇ D p to D p + 1 / 2 ⁇ D p existing in the raw material Y. in which a tubular collector in the collected D p -1 / 2 ⁇ D p was determined D p + 1 / 2 ⁇ D p weight ratio of the particle size in the range of.
  • FIG. 13 shows the relationship between the particle size obtained from the results of Examples 2 to 4 and the partial separation efficiency.
  • FIG. 14 shows the relationship between the particle size obtained from the results of Examples 5 to 7 and the partial separation efficiency.
  • FIG. 15 shows the relationship between the particle size obtained from the results of Examples 8 to 13 and the partial separation efficiency.
  • FIG. 16 shows the relationship between the particle size obtained from the results of Examples 14 to 19 and the partial separation efficiency.
  • E c 100 * m c / m o (m c is the mass of all particles collected by the first cylindrical collector, m o is the raw material Y supplied to the cyclone tower Of mass).
  • FIG. 17 shows the relationship between the flow rate q of the additional airflow S and the classification accuracy index ⁇ calculated from FIG.
  • the swirling direction of the swirling flow R and the swirling direction of the swirling flow U are the same, and the additional air flow introducing pipe is shown in FIGS. 10 (a) and 10 (b).
  • Example 20 ⁇ Cyclone type powder classifier (configuration shown in FIG. 1)> Diameter of upper cylindrical part of cyclone tower: 72mm Length of upper cylindrical part of cyclone tower: 168mm Radius r 1 of the lower end opening of the trunk leg of the cyclone tower: 19 mm Cyclone tower body leg length: 215mm Length of the inclined surface of the tapered portion of the first cylindrical collector: 42 mm Diameter of lower end opening of cylindrical portion of first cylindrical collector: 35 mm Length of the cylindrical part of the first cylindrical collector: 208 mm The length of the inclined surface of the second cylindrical collector: 23 mm When a straight line in the vertical direction is extended from the inner peripheral wall of the lower end opening of the trunk leg toward the inclined surface of the second cylindrical collector, and the position where this straight line and the inclined surface intersect is defined as E Length x extending from the position E to the outside of the inclined surface (hereinafter also referred to as “length x”): 23 mm Radius r 2 of upper end opening
  • Example 21 The same operation as in Example 20 was performed using the same cyclonic powder classifier as in Example 20, except that the radius r 2 of the upper end opening of the second cylindrical collector was 15 mm.
  • Example 22 The same operation as in Example 20 was performed using the same cyclonic powder classifier as in Example 20, except that the radius r 2 of the upper end opening of the second cylindrical collector was 10 mm.
  • FIG. 19 shows the relationship between the particle size and the partial separation efficiency as classification results of Examples 20-22.
  • Cyclone powder classifier 32 Constant supply device 36 Dispersion device 38 Cyclone tower 39 First cylindrical collector 39a Lower end opening 40 Inlet pipe 42 Upper peripheral wall 43 Opening part 46 Centrifugal chamber 48 Outlet pipe 48a Lower end opening 50 Fine powder Discharge port 51 Fine powder collection part 52 Body leg part 53 Tapered part 53a widening at the end Inclined surface 54 Suction blower 55 Second cylindrical collector 55a S-shaped passage 55b Inclined surface 55c Lower end opening 55d Upper end opening 56 Between partitions Inclined passage 57 Additional air flow introduction pipe 60 Ring-shaped member 61 Peripheral wall 62a Hole 62b Nozzle 64 Valve 66 Valve 67 Additional air flow storage chamber 68 Air discharge hole M Coarse particles m Predetermined intermediate particles R Swirling flow S Additional air flow

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Cyclones (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

L'invention vise à procurer un dispositif de classification de poudre du type à cyclone pour éliminer encore davantage une poudre de particules grossières à partir d'une poudre collectée à l'intérieur d'une chambre centrifuge, de façon à séparer une poudre ayant une taille de particules supérieure à une taille désirée. A cet effet, selon l'invention, une partie effilée (53) qui s'élargit vers le bas de celle-ci s'étend à partir du bas d'une chambre centrifuge (46), et un premier collecteur cylindrique (39) est relié au bas de la partie effilée (53). Un second collecteur cylindrique (55), qui se rétrécit vers l'extrémité de celui-ci, est reçu à l'intérieur du premier collecteur cylindrique (53). De plus par l'introduction d'un écoulement d'air additionnel (S) dans la chambre centrifuge (46), des particules intermédiaires d'un poids prescrit ou inférieur à celui-ci sont agitées vers le haut, et séparées vers l'extérieur par l'intermédiaire d'une ouverture d'extrémité inférieure (55c) du second collecteur cylindrique (55).
PCT/JP2015/067254 2014-06-16 2015-06-16 Dispositif de classification de poudre du type à cyclone WO2015194529A1 (fr)

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JP2017185476A (ja) * 2017-01-31 2017-10-12 株式会社アフレアー 集塵装置
CN108380403A (zh) * 2018-03-07 2018-08-10 深圳市宜和勤环保科技有限公司 一种粉碎料颗粒粒径的旋流分选装置及其方法
CN109645834A (zh) * 2017-10-11 2019-04-19 佛山市顺德区美的电热电器制造有限公司 物料清洗容器和烹饪器具

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KR102439543B1 (ko) 2020-12-04 2022-09-05 한국생산기술연구원 미세분말 정밀 포집용 멀티 스텝 사이클론 장치 및 이를 이용한 미세분말 정밀 포집 방법

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JP2002192017A (ja) * 2000-12-26 2002-07-10 Dainippon Ink & Chem Inc 分離装置
WO2013181028A1 (fr) * 2012-05-31 2013-12-05 Dow Global Technologies Llc Hydrocyclone ayant une barrière d'écoulement en vortex

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017185476A (ja) * 2017-01-31 2017-10-12 株式会社アフレアー 集塵装置
CN109645834A (zh) * 2017-10-11 2019-04-19 佛山市顺德区美的电热电器制造有限公司 物料清洗容器和烹饪器具
CN109645834B (zh) * 2017-10-11 2023-12-19 佛山市顺德区美的电热电器制造有限公司 物料清洗容器和烹饪器具
CN108380403A (zh) * 2018-03-07 2018-08-10 深圳市宜和勤环保科技有限公司 一种粉碎料颗粒粒径的旋流分选装置及其方法

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