JP2018069128A - Charged water particle scattering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charged water particle scattering device capable of causing an adequate amount of charged water particles to arrive at a target portion by putting the particles on an air blast formed by an axial blower.SOLUTION: Charged water particles 25 are ejected toward a tangent of a swirling flow RF of air on an outer circumferential part of the swirling flow ejected from an ejection port 1202B. Therefore, the charged water particles 25 can be efficiently mixed to the swirling flow RF of air by utilizing the swirling flow RF while suppressing deceleration of flux of the swirling flow RF and, in other words, an adequate amount of charged water particles 25 can be put on an air blast formed by an axial blower 12 by utilizing the swirling flow RF. Thereby, the adequate amount of charged water 25 are put on an air blast formed by the axial blower 12 and are advantageously and reliably transferred to a dust generation portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a charged water particle spraying device.

At work sites such as earthwork, dust is likely to be generated. When a large amount of dust is generated, there is a risk that work efficiency will be reduced and the work environment and surrounding environment will be deteriorated.
Therefore, in order to suppress the generation of dust, we propose a charged water particle spraying device that transports charged water particles charged with water particles to a space where dust is generated by air flow, and adsorbs and drops dust by charged water particles. (See Patent Document 1).
In this prior art, a blower that flows in one direction from the outlet is used, and the central axis of the flow of air formed by the blower and the central axis of ejection of the charged water particles are more than the ejection position of the charged water particles. The charged water particle spraying device is arranged so as to intersect at one point in front.

Japanese Patent No. 597219

On the other hand, the charged water particles have a higher specific gravity than air.
Therefore, in the prior art, even if a large amount of charged water particles are allowed to enter the air flow formed by the blower by simply intersecting, there is a disadvantage in efficiently mixing the large amount of charged water particles into the air flow.
In the prior art, a large amount of charged water particles are caused to enter the air flow formed by the blower from a large number of locations spaced in the circumferential direction of the casing of the blower. The speed of the air flow formed by the blower is reduced by the flow of air containing particles.

For this reason, a sufficient amount of charged water particles cannot be transported to the target location, and the effect of sufficiently suppressing the generation of dust during construction cannot be expected.
The present invention has been devised by paying attention to the fact that in the range of several meters ahead of the outlet of the axial blower, the air ejected from the outlet forms a swirling flow with a large flow velocity, An object of the present invention is to efficiently mix charged water particles ejected from the charged water particle ejection section into a swirling flow while suppressing a reduction in the flow velocity of the swirling flow, and to supply a sufficient amount of charged water particles with an axial flow fan. It is an object of the present invention to provide a charged water particle spraying device that can be placed on the produced airflow and reach a target location and is advantageous in suppressing the generation of dust in construction.

In order to achieve the above-mentioned object, the invention according to claim 1 includes an axial blower and a charged water particle jetting part for jetting charged water particles, and the axis of the charged water particle jetting part is the axis of the shaft. It arrange | positions so that it may be located on the tangent of the swirl flow in the outer peripheral part of the swirl flow of the air which blows off from the blower outlet of a flow blower.
The invention according to claim 2 is characterized in that a plurality of the charged water particle ejection portions are arranged at intervals in the circumferential direction of the air outlet.
According to a third aspect of the present invention, the axial blower includes a casing having the outlet, a removable frame member is attached to the casing, and the charged water particle ejection portion is the frame member. It is characterized by being supported.
The invention according to claim 4 is characterized in that the charged water particle ejection portion is supported so that its axis can be tilted and adjusted in a direction intersecting with the axial direction of the casing.
The invention according to claim 5 is characterized in that, in the axial center direction of the casing, the charged water particle ejection portion is located at a location displaced toward the suction port side of the casing with respect to the blowout port. And

According to the first aspect of the present invention, the charged water particles ejected from the charged water particle ejecting portion are efficiently mixed into the swirling flow while suppressing the speed reduction of the swirling flow created by the axial blower. Then, a sufficient amount of charged water particles can be put on the air blow produced by the axial blower to reach the target location, which is advantageous in suppressing the generation of dust during construction.
According to the second aspect of the present invention, a sufficient amount of charged water particles can be placed on the air blow produced by the axial blower to reach the target location, which is advantageous in suppressing the generation of dust in construction. It becomes.
According to the invention described in claim 3, it is advantageous in enhancing the versatility of the charged water particle spraying device.
According to the invention of claim 4, the direction of the charged water particle ejecting portion can be appropriately changed in accordance with the change in the blowing amount of the axial blower, and the charged water particles are efficiently mixed with the swirling flow of air, and a sufficient amount This is advantageous in efficiently placing the charged water particles on the air flow formed by the axial blower.
According to the invention described in claim 5, it is advantageous in efficiently mixing the charged water particles into the swirling flow of air.

It is a principal part cross-sectional side view of a charged water particle spraying apparatus. It is a front view of a charged water particle spraying device. It is sectional drawing which shows the structure of a charged water particle ejection part. It is a block diagram which shows the structure of a charged water particle spraying apparatus. It is explanatory drawing at the time of using a charged water particle spraying apparatus in the work site using a backhoe.

(First embodiment)
Hereinafter, the present embodiment will be described with reference to the drawings.
The charged water particle spraying device 10 transfers the charged water particles 25 to the charged water particles 25 by moving the charged water particles 25 by an air flow to a place where a large amount of dust is generated or a place where the dust is scattered at a site where earthwork or soil improvement work is performed. Is adsorbed and dropped onto the ground to suppress the generation of dust and to remove dust in the atmosphere.
As shown in FIGS. 1, 2, and 4, the charged water particle spraying device 10 includes an axial blower 12, a plurality of charged water particle ejection units 14, a frame member 16, a tank 18, a pump 20, A charging power source 22 and a control unit 24 are included.

As shown in FIG. 1, the axial flow fan 12 includes a cylindrical casing 1202, a fan 1204 disposed inside the casing 1202, a frame 1206 that supports the casing 1202 so as to be swingable up and down, and a frame 1206. It includes a plurality of moving casters 1208 provided in the lower part.
The axial blower 12 blows air from the axial direction of the casing 1202 in the suction axial direction, sucks air from the suction port 1202A at one end of the casing 1202, and blows air from the blowout port 1202B at the other end.
Further, in the axial blower 12, the air blown from the outlet 1202B forms a swirling flow RF in a range of several meters ahead of the outlet 1202B.

In the case where the stationary blade (or guide blade) is provided, the swirl flow RF on the outlet 1202B side of the axial blower 12 is reduced. In the present invention, the swirling flow RF is actively used to transport the charged water particles, and in the present invention, the axial fan 12 omits a stationary blade (or guide blade) that reduces the swirling flow RF. Means what
The fan 1204 includes a motor 1210 supported at the center inside the casing 1202 and a plurality of blade bodies 1212 that are rotationally driven by the motor 1210. The motor 1210 and the control unit 24 are electrically connected. Yes.
In addition, various conventionally well-known structures, such as a multistage axial flow fan, can be employ | adopted as such an axial flow fan 12, and a commercial item is used in this Embodiment.

The charged water particle ejection unit 14 ejects the charged water particles 25.
In the present embodiment, a plurality (four) of charged water particle ejection portions 14 are provided.
As shown in FIG. 3, each charged water particle ejecting portion 14 includes a nozzle portion 26 and an annular dielectric electrode portion 30 provided in the nozzle portion 26, and CL in the figure indicates the charged water particle ejecting portion 14. The axial center of the nozzle portion 26 is shown.
The nozzle part 26 includes a base part 2602, a cover part 2604, and a spray part 2606.
The base portion 2602 has a cylindrical shape, and the space inside the base portion 2602 in the radial direction is a passage 2608 through which water is supplied.
A flexible water supply pipe 34 is connected to the base 2602 via a joint 3402, and the water supply pipe 34 is connected to the pump 20 via a distribution valve 34 </ b> A and is connected to the tank 18 via a hose 19. .

The cover portion 2604 is provided at the tip of the base portion 2602 and has a cylindrical shape coaxial with the base portion 2602 with an outer diameter larger than that of the base portion 2602.
In this embodiment, the base portion 2602 and the cover portion 2604 are integrally formed of an insulating material. Note that the base portion 2602 and the cover portion 2604 may be formed separately, but at least the cover portion 2604 is required to be formed of an insulating material in order to charge water particles.
The spray part 2606 is formed in a cylindrical shape coaxial with the base part 2602 and the cover part 2604, and is located at the inner center of the cover part 2604.
The space inside the spray unit 2606 communicates with the passage 2608, the base end of the spray unit 2606 is connected to the inner periphery of the cover unit 2604, and a spray hole 2614 for ejecting water particles is formed at the center of the tip of the spray unit 2606. Has been.
In the present embodiment, the spray holes 2614 are formed so that the average particle diameter of the water particles is 80 to 250 μm.

The annular dielectric electrode portion 30 is embedded in a portion of the cover portion 2604 that is separated in the direction away from the base portion 2602 with respect to the spray hole 2614 in the axial direction.
The annular dielectric electrode part 30 extends over the entire circumference of the cover part 2604.
Therefore, when a high voltage is applied to the annular dielectric electrode portion 30 by the charging power source 22 described later, water particles ejected from the spray holes 2614 are charged, and the average particle size is 80 to 250 μm from the charged water particle ejecting portion 14. Charged water particles 25 are ejected.
In addition, there are various charging methods such as a dielectric charging method and a corona discharge method, and various conventionally known structures can be adopted as the charged water particle ejecting portion 14, and in this embodiment, the charged water particle ejecting portion. 14 is a commercially available product of dielectric charging system.
Further, the charging power source 22 and the annular dielectric electrode portion 30 of one nozzle portion 26 are connected via a cable 23A in which a waterproof connector 2302 is interposed.
Further, the application of a high voltage to the annular dielectric electrode portion 30 of the nozzle portion 26 adjacent to the nozzle portion 26 is performed by another cable connected to the annular dielectric electrode portion 30 of the nozzle portion 26 and provided with a waterproof connector 2302. 23B is connected.
Similarly to the above, the annular dielectric electrode portion 30 of the remaining nozzle portion 26 is configured to be sequentially applied with a high voltage by being connected in series via cables 23C and 23D provided with a waterproof connector 2302. ing.

The frame member 16 supports each charged water particle ejection portion 14 on the outer side in the radial direction of the outer peripheral surface of the front portion of the casing 1202.
The frame member 16 includes an annular attachment member 1602 that is detachably attached to the outer peripheral surface of the front portion of the casing 1202, and a plurality of locations (four locations in the present embodiment) that are equally spaced in the circumferential direction of the attachment member 1602. ) And a universal joint 1606 attached to the rod 1604. Therefore, the charged water particle ejecting portion 14 is detachably provided in the casing 1202, and the versatility of the charged water particle spraying apparatus 10 is enhanced.
Each charged water particle ejecting portion 14 is attached to a rod 1604 via a universal joint 1606, and each charged water particle ejecting portion 14 is supported so as to be adjustable in tilt in a direction intersecting the axial direction of the casing 1202.

In this state, the plurality of charged water particle ejection portions 14 connected to the water supply pipes 34 are arranged radially outside the front portion of the casing 1202 by the frame member 16, and the plurality of charged water particle ejection portions 14 are the casings. 1202 is located in the circumferential direction at equal intervals.
Further, the charged water particle ejecting portion 14 is arranged such that its axis CL is directed to the tangent of the swirling flow of air at the outer peripheral portion of the swirling flow RF blown out from the outlet 1202B of the axial flow fan 12.
Here, the outer peripheral portion of the swirl flow RF is a portion where the swirl flow RF is reliably formed. As shown in FIG. 2, when the diameter of the swirl flow RF is D, a circle having a diameter of D / 2 is D / 2. The outer circular part of the outer periphery of the swirl flow RF is the outer peripheral part.
In the present embodiment, the axial center CL is located at an intermediate portion of the outer peripheral portion in the diameter D direction of the swirling flow RF (a location at a size of 1 / 8D from the outer periphery of the swirling flow RF toward the radially inner side of the swirling flow RF). The charged water particle ejecting portion 14 is disposed so as to pass on the tangent of the swirl flow in other words, in other words, on the tangent of the swirl flow.
Further, as shown in FIG. 1, in the axial direction of the casing 1202, the tip end of the charged water particle ejection portion 14 is located at a position displaced toward the suction port 1202A side of the casing 1202 from the blowing port 1202B.

As shown in FIG. 4, the tank 18 stores water.
The pump 20 supplies water supplied from the tank 18 via the hose 19 to the nozzle part 26 of each charged water particle ejection part 14 via the distribution valve 34A and the water supply pipe 34. The execution and stop of the operation are controlled by the control unit 24.
The charging power source 22 transforms the voltage of the commercial power source and applies a high voltage (for example, 7500 V) to the annular dielectric electrode portion 30 of each charged water particle ejection portion 14 via the cables 23A to 23D.
In the present embodiment, by applying a positive voltage to the annular dielectric electrode portion 30, the negatively charged charged water particles 25 are ejected from each charged water particle ejecting portion 14, but this is not the case. Conversely, by applying a negative voltage to the annular dielectric electrode portion 30, the positively charged charged water particles 25 may be ejected from each charged water particle ejecting portion 14.
Execution and stop of voltage application by the charging power source 22 are controlled by the control unit 24.
If well water or water supply can be used as the water source, the tank 18 is not necessary.
The control unit 24 executes or stops the dust suppressing operation for ejecting the charged water particles 25 by the charged water particle ejecting unit 14 and forming the air flow by the axial blower 12. The control unit 24 functions when commercial power is supplied.

Next, a method for using the charged water particle scattering apparatus 10 will be described.
FIG. 5 shows an example of use in earth work in which the ground G is excavated using the construction machine 52.
Although the case where the construction machine 52 is the backhoe 52A will be described in the present embodiment, the construction machine 52 is not limited to the backhoe 52A, and may be a variety of conventionally known construction machines 52 such as a bulldozer. .
The vertical flow direction of the axial blower 12 and the location where dust is generated by excavation of the ground G by the bucket B of the backhoe 52A, that is, the air flow reaches the space S above the ground G to be excavated and Adjust the horizontal direction.

By operating the switch of the control unit 24 or operating the remote controller, the pump 20, the charging power source 22, and the motor 1210 are turned on to execute the dust suppression operation.
As a result, the charged water particles 25 are ejected toward the tangential line of the swirl flow of the air at the outer periphery of the swirl flow RF blown out from the outlet 1202B, swirl while being mixed with the air by the swirl flow RF, and the axial flow The air flow formed by the blower 12 is carried toward the space S.
Since the charged water particles 25 that have reached the space S are negatively charged, for example, after the dust in the space S is adsorbed by the Coulomb force, the charged water particles 25 fall on the ground due to their own weight.
The average particle diameter of the charged water particles 25 is 80 to 250 μm as described above, whereas the average particle diameter of the dust is, for example, 10 μm or less.
Generation | occurrence | production of the dust of the space S is suppressed by adsorb | sucking and falling of the dust by such the charged water particle 25. FIG.

According to the present embodiment, the charged water particles 25 are ejected from the charged water particle spraying device 10 toward the tangent line of the swirling flow of air in the outer peripheral portion of the swirling flow RF blown out from the outlet 1202B.
Therefore, the charged water particles 25 can be efficiently mixed into the air swirl flow RF using the swirl flow RF while suppressing the deceleration of the flow velocity of the swirl flow RF. In other words, a sufficient amount of the swirl flow RF is utilized. The charged water particles 25 can be efficiently put on the air flow formed by the axial flow fan 12.
This is advantageous in reliably transferring a sufficient amount of the charged water particles 25 to the dust generation location on the air flow formed by the axial blower 12.
In the present embodiment, since a plurality of charged water particle ejection portions 14 are arranged, it is more advantageous to reliably transfer a sufficient amount of charged water particles 25 to the dust generation location.
Therefore, it is advantageous to improve the working efficiency by effectively suppressing the dust scattering, and the influence of the dust on the driver of the backhoe 52A or the operator located on the site is suppressed. This is advantageous for maintaining a good work environment on site.
In addition, it is possible to suppress the dust from flowing to houses near the site by wind, which is advantageous for maintaining a good surrounding environment near the site.

Moreover, since the charged water particle ejection part 14 is detachably provided in the casing 1202 of the axial flow fan 12, the charged water particle ejection part 14 can be attached to the commercially available axial flow fan 12, and the charged water particle spraying device. This is advantageous in increasing the versatility of 10.
Further, the charged water particle ejection portion 14 is supported so as to be adjustable in tilt in a direction intersecting with the axial direction of the casing 1202.
Therefore, the direction of the charged water particle ejecting portion 14 can be appropriately changed in accordance with the change in the amount of air blown from the axial flow fan 12, and the charged water particles 25 are efficiently mixed with the swirling flow RF of air, so that a sufficient amount of charged water particles is obtained. This is advantageous in efficiently placing 25 on the air flow formed by the axial blower 12.

In the present invention, in the axial direction of the casing 1202, the tip of the charged water particle ejection portion 14 may be disposed in front of the outlet 1202B. However, as in the present embodiment, the axis of the casing 1202 When the tip of the charged water particle ejection portion 14 is arranged in a position displaced in the center direction toward the suction port 1202A side of the casing 1202 relative to the blowout port 1202B, the following effects can be obtained.
That is, in the range of several meters in front of the outlet 1202B, the flow velocity of the swirling flow RF is extremely high, and the air around the swirling flow RF is drawn into the swirling flow RF.
Therefore, interference of the charged water particle ejecting portion 14 with the air flow drawn into the swirling flow RF can be suppressed, and therefore the charged water particles 25 are swirled into the swirling flow using the air flow drawn into the swirling flow RF. This is advantageous for efficient mixing with RF, and is advantageous for efficiently placing a sufficient amount of charged water particles 25 on the air flow formed by the axial flow fan 12.

  In addition, in embodiment, the case where the charged water particle spraying apparatus 10 was used on the site of earthwork was demonstrated. However, the use of the charged water particle spraying device 10 is not limited to the embodiment, and for example, a loading place where dust generation products that generate dust such as excavated earth and sand and waste are loaded on the loading platform of the dump truck, and soil Of course, it can be widely used in a place where dust is generated, such as a place where a soil conditioner is installed.

DESCRIPTION OF SYMBOLS 10 Charged water particle spraying device 12 Axial-flow fan 1202 Casing 1202A Suction port 1202B Blowout port 1204 Fan 1206 Frame 1210 Motor 16 Frame member 14 Charged water particle ejection part 22 Charging power supply 26 Nozzle part 30 Annular dielectric electrode part 34 Flexible water supply Tube RF Swirl CL Axis of charged water particle ejection

Claims (5)

An axial blower,
A charged water particle ejection part for ejecting charged water particles,
The charged water particle ejection portion is arranged such that its axial center is located on the tangent line of the swirl flow at the outer peripheral portion of the swirl flow of air blown from the outlet of the axial blower,
Charged water particle spraying device characterized by that. A plurality of the charged water particle ejection portions are arranged at intervals in the circumferential direction of the outlet,
The charged water particle spraying device according to claim 1. The axial blower includes a casing having the blowout port,
A removable frame member is attached to the casing,
The charged water particle ejection part is supported by the frame member,
The charged water particle spraying apparatus according to claim 1 or 2, wherein The charged water particle ejection part is supported so that its axis can be tilted and adjusted in a direction intersecting with the axial direction of the casing.
The charged water particle spraying device according to any one of claims 1 to 3, wherein In the axial direction of the casing, the charged water particle ejection portion is located at a location displaced toward the suction port side of the casing from the blowout port.
The charged water particle spraying device according to any one of claims 1 to 4, wherein

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