JP2010131158A - Dust collection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cyclone dust collection device for separating and removing powder dust included in atmospheric air, which is capable of retaining a high dust collecting efficiency while retaining the setting space by reducing the pressure loss. <P>SOLUTION: When air is introduced into the dust collection device 1, swirling flow is generated within an annular chamber 2 and the centrifugal force is applied to the powder dust in air. The powder dust descends while swirling along the inner wall surface of a cone-shaped tube 5 to fall into a dust collection chamber 6. When an axial flow fan 10 mounted within an exhaust chamber 8 is rotated and operated, the pressor action works and the still pressure in an exhaust port 9 rises higher than the pressure on an inner cylinder side, and as a result, the pressure loss as the dust collection device can be reduced. In this way, the dust collection device having the high dust collection efficiency while retaining the setting space by reducing the pressure loss can be provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust collector that separates and removes dust contained mainly in the atmosphere.

  A conventional cyclone type dust collector is connected to a blower and sucks air containing dust, and generates a swirling flow inside to centrifuge the dust. The airflow descends while turning inside the apparatus, reverses at the lower part of the apparatus, and flows out of the apparatus through the flow path inside the apparatus.

  Hereinafter, an example of a conventional cyclone dust collector will be described with reference to FIG.

  The dust collector 101 includes an outer cylinder 102, an intake port 103 connected in the tangential direction of the outer circumference circle, a conical cylinder 104 connected to the lower end of the outer cylinder 102, a dust collection chamber 105 connected to the lower end of the conical cylinder 104, an outer cylinder. An inner cylinder 106 and an exhaust chamber 107 are provided so as to penetrate the center of 102 in the axial direction. Air containing dust flows into the outer cylinder 102 from the air inlet 103, and centrifugal force is applied to the dust in the air when the air swirls within the outer cylinder 102, and the dust is attracted to the side wall inside the outer cylinder 102. The air containing dust further descends while turning around the inner wall surface of the conical cylinder 104, and drops the dust into the dust collection chamber 105. The air from which the dust has been removed is sucked up from the lower end of the inner cylinder 106 and discharged from the exhaust port 108 via the exhaust chamber 107. Although not shown, in order to allow air to flow through the dust collector 101, it is general that an air blowing means is connected to the upstream side of the intake port 103 or the downstream side of the exhaust port 108.

There exists patent document 1 as what applied such a conventional cyclone type dust collector to a house.
JP 2005-127560 A

  It is known that the conventional cyclone dust collector is effective to speed up the internal swirl flow in order to increase the dust collection efficiency. In order to speed up the swirl flow, it is only necessary to increase the air flow rate, but there is a problem that the pressure loss as the dust collector increases. In addition, when the pressure loss of the air blowing unit connected to the dust collector increases, it becomes impossible to flow a predetermined air flow rate. Therefore, the air blowing unit must be enlarged to secure the air flow rate. There exists a subject that the installation space according to a means increases.

  This invention solves such a conventional subject, and it aims at providing a dust collector which has high dust collection efficiency, reducing a pressure loss and maintaining installation space.

  In order to achieve the above object, the dust collector of the present invention has a cylindrical annular chamber and an inlet connected to a tangential direction of the outer periphery of the annular chamber, a vent on the bottom surface of the annular chamber, and connected to the vent An outer cylinder, a conical cylinder connected to the lower side of the outer cylinder, a dust collecting chamber below the conical cylinder, an inner cylinder penetrating through the center of the annular chamber in the axial direction of the outer cylinder, and an inner cylinder disposed above the annular chamber An exhaust chamber connected to the exhaust chamber, and a cyclone type dust collector provided with an exhaust port on a side surface of the exhaust chamber, characterized in that an axial fan is provided inside the inner cylinder, When the flow fan is operated, the pressure increasing action works and the pressure loss as the dust collecting device can be reduced.

  According to the present invention, when the axial fan provided in the exhaust chamber of the dust collector is operated, the pressure increasing action works and the pressure loss as the dust collector can be reduced. At this time, since the axial fan is provided inside the inner cylinder, the outer dimension of the dust collecting device does not increase. In addition, since it is not necessary to increase the size of the blowing means to be connected as long as the same amount of air flows, the dust collecting apparatus having high dust collection efficiency is maintained while maintaining the installation space of the dust collecting apparatus and the blowing means. can do.

  The dust collector according to claim 1 of the present invention includes a cylindrical annular chamber and an inlet connected to a tangential direction of the outer periphery of the annular chamber, a vent on the bottom surface of the annular chamber, and an outer cylinder connected to the vent. A conical cylinder connected to the lower side of the outer cylinder, a dust collecting chamber below the conical cylinder, an inner cylinder penetrating through the center of the annular chamber in the axial direction of the outer cylinder, and an upper part of the annular chamber connected to the inner cylinder A cyclone type dust collector having an exhaust chamber and an exhaust port on a side surface of the exhaust chamber, characterized in that an axial fan is provided inside the inner cylinder, and the axial fan operates. By doing so, the pressure increasing action works, and the pressure loss as a dust collector can be reduced.

  A dust collector according to claim 2 of the present invention is characterized in that, in the dust collector according to claim 1, the impeller of the axial fan is a turbo blade, It has the effect that a high boosting effect can be obtained.

  The dust collector according to claim 3 of the present invention is the dust collector according to claim 2, characterized in that the rear edge of the turbo blade protrudes from the inner cylinder and is in the exhaust chamber. By generating a radial component in the flow coming out of the air, the flow to the exhaust port is smoothed, and pressure loss and noise can be reduced.

  A dust collector according to a fourth aspect of the present invention is the dust collector according to the third aspect, wherein the upper end of the inner cylinder and the bottom surface of the exhaust chamber are connected by a curved surface, and the exhaust gas is exhausted from the inner cylinder. It has the effect of reducing the resistance of air flowing into the chamber.

  The dust collector according to claim 5 of the present invention is the dust collector according to any one of claims 1 to 4, characterized in that the swirling direction of the air flow in the annular chamber is opposite to the rotation direction of the axial fan. Therefore, since the swirl flow remains in the flow inside the inner cylinder, the flow into the axial fan becomes smooth and the air blowing efficiency of the axial fan is increased.

  A dust collector according to a sixth aspect of the present invention is the dust collector according to any one of the first to fifth aspects, wherein a stationary blade is disposed on the upstream side of the impeller inside the inner cylinder, and the airflow is a rotation of an axial fan. This is characterized by generating a swirling flow in the direction opposite to the direction, and the inflow to the axial fan is smoothed by the vane giving the swirling flow to the flow inside the inner cylinder. It has the effect of increasing efficiency.

  The dust collector according to claim 7 of the present invention is characterized in that in the dust collector according to claim 6, the number of blades of the impeller and the number of stationary blades are not divisible by a mutual divisor, It has the effect that noise can be reduced by suppressing the interference between the blade and the stationary blade that is generated when the impeller rotates.

  The dust collector according to claim 8 of the present invention is the dust collector according to any one of claims 3 to 7, wherein the motor of the axial fan is fixed to the inner cylinder, and the axial fan and the inner cylinder are integrated. The structure is characterized in that the outer cylinder and the conical cylinder can be separated and the inner cylinder can be separated from the annular chamber, and since the axial flow fan is integrated with the dust collecting device, the shaft can be drawn downward. It has the effect that the inspection work of the flow fan can be easily performed.

  A dust collector according to a ninth aspect of the present invention is the dust collector according to any one of the first to eighth aspects, wherein the junction between the bottom surface of the annular chamber and the outer cylinder is a curved surface. , It has the effect of reducing the resistance of air flowing from the annular chamber to the outer cylinder.

  The dust collector according to claim 10 of the present invention is characterized in that, in the dust collector according to any one of claims 1 to 9, the corner of the annular chamber is formed with a curved surface, and the stagnation of the airflow It has the effect | action that it can suppress that dust accumulates in a corner | angular part by reducing.

  The dust collector according to claim 11 of the present invention is characterized in that, in the dust collector according to any one of claims 1 to 10, the ratio of the inner cylinder diameter to the outer cylinder diameter is 0.6 or more. There is an effect that the pressure loss generated when the air descending from the outer cylinder to the conical cylinder is reversed and ascends the inner cylinder can be reduced.

  A dust collector according to a twelfth aspect of the present invention is the dust collector according to any one of the first to eleventh aspects, wherein the conical cylinder has an inclination of 30 ° or less. The pressure loss can be reduced by reducing the resistance of the descending air.

  A dust collector according to claim 13 of the present invention is the dust collector according to any one of claims 1 to 12, wherein an insect repellent net is provided at the lower end of the inner cylinder. When the device is used in an environment in which outdoor air is directly sucked, small insects are mixed with dust and collected in the dust collection chamber. In the state where the dust collecting device is stopped, the insects can be prevented from flying into the clean side space such as the exhaust chamber from the inner cylinder by flying by themselves.

  The dust collector according to claim 14 of the present invention is the dust collector according to any one of claims 1 to 13, wherein the dust concentration between the lower end of the inner cylinder and the exhaust port is detected and the dust concentration becomes a certain level or more. The centrifugal fan is sometimes stopped, and the dust accumulated in the dust collection chamber is re-scattered by the swirling airflow, sucked up by the inner cylinder, and flows into the clean space such as the exhaust chamber. It has the effect that it can be prevented.

  The dust collecting device according to claim 15 of the present invention is characterized in that in the dust collecting device according to claim 14, the dust collecting device is provided with a display means for displaying that the dust concentration has become a certain level or more and the centrifugal fan has stopped. There is an effect that the user can be alerted to discard the dust accumulated in the dust collection chamber.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view of a dust collector according to Embodiment 1 of the present invention, and FIG. 2 is a side sectional view of the dust collector according to Embodiment 1 of the present invention. As shown in FIGS. 1 and 2, a cyclone type dust collector 1 includes a cylindrical annular chamber 2, an inlet 3 connected in a tangential direction of the annular chamber 2, and an outer cylinder 4 connected to the bottom surface of the annular chamber 2. A conical cylinder 5 connected to the lower end of the outer cylinder 4, a dust collecting chamber 6 connected to the lower end of the conical cylinder 5, an inner cylinder 7 that penetrates the center of the annular chamber 2 in the axial direction of the outer cylinder 4, and an upper part of the annular chamber 2. An exhaust chamber 8 disposed and connected to the inner cylinder 7, an exhaust port 9 in the side surface of the exhaust chamber 8, and an axial fan 10 in the inner cylinder 7, and the annular chamber 2, the outer cylinder 4, the conical cylinder 5, The dust collection chamber 6, the inner cylinder 7, and the exhaust chamber 8 are all arranged concentrically. As the material of each component, a resin having excellent heat insulation properties such as polystyrene is used in consideration of ventilation and air conditioning applications, but a heat insulating material such as urethane foam may be attached to the outer surface of a metal material.

  The dust collector 1 is disposed on the ceiling of a building or the like and is connected by an air inlet 3 and an air outlet 9 in the middle of a duct through which air for ventilation or air conditioning flows by a blowing means. When the blowing means is operated and air is introduced into the dust collector 1, a swirling flow is generated in the annular chamber 2, and centrifugal force is applied to the dust in the air. Due to the centrifugal force, the dust moves toward the outer peripheral wall of the annular chamber 2 and enters the space between the outer cylinder 4 and the inner cylinder 7 from the annular chamber 2 while swirling with the air. Further, the dust falls while turning along the inner wall surface of the conical cylinder 5 and falls into the dust collecting chamber 6. The clean air from which the dust is separated is sucked from the lower end of the inner cylinder 7 and is discharged from the exhaust port 9 via the exhaust chamber 8.

  3 is an enlarged view of the axial fan portion of FIG. 2, and FIG. 4 is a cross-sectional view of the exhaust chamber cut along a plane perpendicular to the axial direction of the inner cylinder. As shown in FIGS. 3 and 4, the impeller 11 of the axial fan 10 is a resin-integrated product, and a plurality of turbo blades 12 are arranged. The rotation center of the impeller 11 is connected to the rotation shaft 14 of the electric motor 13, and the electric motor 13 is fixed by the electric motor support frame 15 so that the rotation shaft 14 coincides with the central axis of the inner cylinder 7. When the axial fan 10 rotates and operates, the pressure increasing action works and the static pressure of the exhaust port 9 becomes higher than that in the inner cylinder 7, so that the pressure loss as a dust collector can be reduced. The turbo type blade can obtain a higher pressure increasing effect at a lower rotation than other blades such as a propeller type and a mixed flow type.

  Further, the rear edge of the blade 12 protrudes from the inner cylinder 7 and is disposed in the exhaust chamber 8. With this arrangement, a radial component in addition to the axial direction is generated in the flow coming out of the impeller 11, so that the flow to the exhaust port 9 on the side surface of the exhaust chamber 8 becomes smooth, pressure loss and an axial fan The noise generated from 10 can be reduced. Furthermore, the upper end 16 of the inner cylinder 7 and the bottom surface 17 of the exhaust chamber 8 are connected by a curved surface, and the resistance of air flowing from the inner cylinder 7 to the exhaust chamber 8 can be reduced.

  The rotation direction of the impeller 11 is counterclockwise when viewed from above the exhaust chamber 8 on the anti-suction side, and is opposite to the swirl direction of the airflow in the annular chamber 2 flowing from the intake port 3. A plurality of stationary blades 18 are arranged inside the inner cylinder 7, and a swirling flow that coincides with the swirling direction of the airflow in the annular chamber 2 that flows in from the inlet 3 in the direction opposite to the rotation direction of the axial flow fan 10. Can be generated. Thereby, even if the swirling flow of the flow rising up the inner cylinder 7 is weakened, the swirling flow can be given by the stationary blade 18, the inflow to the axial fan becomes smooth, and the blowing efficiency of the axial fan is increased. be able to.

  The lower end 19 of the inner cylinder 7 extends from the bottom surface 20 of the annular chamber to the vicinity of the middle of the outer cylinder 4. Due to the position of the lower end 19, the dust separated by the swirling flow is guided to the dust collecting chamber 6 along with the downward flow through the conical cylinder 5, and clean air is sucked into the inner cylinder 7. If the position of the lower end 19 is close to the bottom surface 20 of the annular chamber, it is sucked into the inner cylinder 7 without developing a swirl flow, and conversely, if it is too close to the conical cylinder 5, it will be sucked into the inner cylinder 7 even if dust is separated. , Dust collection efficiency decreases.

  Further, the joint portion 21 between the annular chamber bottom surface 20 and the outer cylinder 4 is formed as a curved surface. This curved surface can reduce the resistance of air flowing from the annular chamber 2 to the outer cylinder 4, thereby reducing pressure loss. Further, the corner portion 22 of the annular chamber 2 is formed as a curved surface. This curved surface can reduce the stagnation of the airflow flowing in the annular chamber 2, so that dust can be prevented from entering the corner portion 22.

  A resin mesh is provided as an insect net 23 on the lower end 19 of the inner cylinder 7. The material of the insect screen 23 is made of polypropylene, which is also used for home screen doors, and the pitch is 1 mm, but the material may be made of metal such as stainless steel. When the dust collector 1 is used in an environment in which outdoor air is directly sucked, a small insect may be mixed together with dust. When the dust collector 1 is in operation, the insects are confined in the dust collection chamber by the swirling flow. However, when the dust collector 1 stops, the insects fly by themselves and the downstream from the inner cylinder 7 via the exhaust chamber 8. Although there is a possibility of intrusion to the side, the insect net 23 can prevent the intrusion.

  FIG. 5 is a graph showing the relationship between the dust collection efficiency and the pressure loss with respect to the ratio d2 / d1 between the inner diameter d1 of the outer cylinder 4 and the inner diameter d2 of the inner cylinder 7 in FIG. As the value of d2 / d1 increases, the dust collection efficiency decreases slightly, but is almost constant. On the other hand, the pressure loss rapidly decreases and becomes almost constant at 0.6 or more. When the value of d2 / d1 is small, the space between the outer cylinder 4 and the inner cylinder 7 is large, so that the air descending to the conical cylinder 5 tends to flow, but the resistance when sucked into the inner cylinder 7 is increased. . Therefore, if the ratio d2 / d1 is 0.6 or more, both high dust collection efficiency and low pressure loss can be achieved. However, if the value of d2 gets too close to the value of d1, the resistance of air toward the conical cylinder 5 increases, so the ratio d2 / d1 is preferably 0.9 or less.

FIG. 6 is a graph showing the relationship between the dust collection efficiency and the pressure loss with respect to the inclination θ _C of the conical cylinder 5 in FIG. When θ _C is 30 ° or more, dust collection efficiency and pressure loss tend to deteriorate. The reason is not clear, but it is considered to be a harmful effect due to the sudden narrowing of the flow path. Therefore, the inclination θ _C of the conical cylinder 5 is preferably set to 30 ° or less.

  FIG. 7 is a perspective sectional view when the conical cylinder and the inner cylinder are disassembled. As shown in FIG. 7, the dust collection chamber 6 can be easily detached from the conical cylinder 5 and the conical cylinder 5 can be easily detached from the outer cylinder 4 for dust disposal and internal cleaning and maintenance. Further, a flange portion 24 is provided on the outer peripheral portion of the inner cylinder 7, and the flange portion 24 is detachable from the inner cylinder mounting hole 25 at the upper portion of the annular chamber. It is possible to pull out the lower side 10 as a single unit. With this disassembled structure, internal cleaning and maintenance, and inspection of the axial fan 10 can be easily performed even after the dust collector 1 is installed on the ceiling or the like and connected to the duct.

  A dust sensor 26 is attached to the motor support frame 15 inside the inner cylinder 7 as means for detecting the dust concentration. The dust sensor 26 uses a photocoupler and a photodiode. The dust sensor 26 irradiates light inside the inner cylinder and determines the density based on the reflected light. A photocoupler and a phototransistor are attached at opposing positions. It does not matter as a transmission type. Control means is provided for cutting off the power to the motor 13 of the axial fan 10 when the dust sensor 26 determines that the dust concentration is above a certain level.

  Further, an LED 27 as a display means for notifying the user that the axial fan 10 is stopped is lit. If the user neglects to dispose of dust while using the dust collector 1 for a long period of time, dust accumulates and does not fit in the dust collection chamber 6 alone and overflows into the conical cylinder 5. When dust overflows in the conical cylinder 5, dust re-scatters due to the swirling flow, and dust is sucked into the inner cylinder 7, causing a phenomenon that flows out from the exhaust port 9 to the downstream side.

  At this time, when the dust sensor 26 detects that the dust concentration has increased, and the axial fan 10 is stopped, the pressure loss of the dust collector 1 increases, so the amount of air blown by the blowing means decreases. When the amount of blown air is reduced, the swirling flow is weakened and the re-scattering of the dust is suppressed, and at the same time, the dust can be prevented from flowing out from the exhaust port 9 to the downstream side. Since the LED 27 is also lit to alert the user, the user can return to the normal use state by discarding the dust in the dust collection chamber 6.

  As described above, when the axial flow fan 10 provided in the exhaust chamber 8 of the dust collector 1 is operated, the pressure increasing action works and the pressure loss as the dust collector 1 can be reduced. At this time, since the axial fan 10 is provided in the exhaust chamber 8, the outer dimensions are not increased.

  The dust collector of the present invention is useful because it collects dust in the air, purifies it, and supplies it to the room when taking outdoor air into the room for ventilation or air conditioning of the building. It can also be applied to air conditioners and air purifiers that are used while circulating indoor air.

The perspective view of the dust collector of Embodiment 1 of this invention Side sectional view of the dust collector of Embodiment 1 of the present invention. Fig. 2 is an enlarged view of the axial fan section. Sectional drawing which cut | disconnected the exhaust chamber of Embodiment 1 of this invention by the surface perpendicular | vertical to the axial direction of an inner cylinder The graph which shows the relationship between dust collection efficiency and pressure loss with respect to ratio d2 / d1 of the outer cylinder diameter and inner cylinder diameter of Embodiment 1 of this invention The graph which shows the relationship between dust collection efficiency with respect to inclination (theta) _C of the cone cylinder of Embodiment 1 of this invention, and pressure loss The perspective sectional view when the conical cylinder and the inner cylinder of Embodiment 1 of the present invention are disassembled A perspective view showing a conventional dust collector

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collector 2 Annular chamber 3 Intake port 4 Outer cylinder 5 Conical tube 6 Dust collection chamber 7 Inner cylinder 8 Exhaust chamber 9 Exhaust port 10 Axial fan 11 Impeller 12 Blade 13 Motor 14 Rotating shaft 15 Motor support frame 16 Upper end 17 Bottom surface 18 Stator blade 19 Lower end 20 Annular chamber bottom surface 21 Joint portion 22 Corner portion 23 Insect screen 24 Flange portion 25 Inner cylinder mounting hole 26 Dust sensor 27 LED
DESCRIPTION OF SYMBOLS 101 Dust collector 102 Outer cylinder 103 Inlet port 104 Conical tube 105 Dust collection chamber 106 Inner cylinder 107 Exhaust chamber 108 Exhaust port

Claims (15)

A cylindrical annular chamber and an inlet connected in a tangential direction of the outer periphery of the annular chamber; a vent on the bottom surface of the annular chamber; an outer cylinder connected to the vent; a conical cylinder connected to the lower side of the outer cylinder; and the cone A dust collection chamber below the cylinder, an inner cylinder that penetrates the center of the annular chamber in the axial direction of the outer cylinder, an exhaust chamber that is disposed at the upper part of the annular chamber and is connected to the inner cylinder, and an exhaust port on the side surface of the exhaust chamber A cyclone type dust collector provided with an axial fan inside the inner cylinder. The dust collector according to claim 1, wherein the impeller of the axial fan is a turbo blade. The dust collector according to claim 2, wherein the rear edge of the turbo blade protrudes from the inner cylinder and is in the exhaust chamber. The dust collector according to claim 3, wherein the upper end of the inner cylinder and the bottom surface of the exhaust chamber are connected by a curved surface. The dust collector according to any one of claims 1 to 4, wherein the swirling direction of the air flow in the annular chamber is opposite to the rotation direction of the axial fan. The dust collector according to any one of claims 1 to 5, wherein a stationary blade is disposed upstream of the impeller inside the inner cylinder, and the airflow generates a swirling flow in a direction opposite to the rotational direction of the axial fan. . 7. The dust collector according to claim 6, wherein the number of impellers and the number of stationary blades are not divisible by each other. The structure in which the motor of the axial fan is fixed to the inner cylinder and the axial fan and the inner cylinder are integrated, wherein the outer cylinder and the conical cylinder can be separated and the inner cylinder can be separated from the annular chamber. The dust collector in any one of 1-7. The dust collector according to any one of claims 1 to 8, wherein a joint portion between the bottom surface of the annular chamber and the outer cylinder is a curved surface. The dust collector according to any one of claims 1 to 9, wherein a corner portion of the annular chamber is formed by a curved surface. The dust collector according to any one of claims 1 to 10, wherein a ratio of an inner cylinder diameter to an outer cylinder diameter is 0.6 or more. The dust collector according to any one of claims 1 to 11, wherein the inclination of the conical cylinder is 30 ° or less. The dust collector according to any one of claims 1 to 12, wherein an insect net is provided at a lower end of the inner cylinder. The dust collector according to any one of claims 1 to 13, wherein the centrifugal fan is stopped when the dust concentration between the lower end of the inner cylinder and the exhaust port is detected and the dust concentration reaches a certain level. 15. The dust collecting apparatus according to claim 14, further comprising display means for displaying that the dust concentration has reached a certain level and the centrifugal fan has stopped.

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