JP2023104831A - Induction charging type electrostatic sprayer - Google Patents

Abstract

To reduce an influence on charging efficiency of droplets by increase/decrease in a spray angle, and flexibly adjust the number of nozzle parts to be arranged and the positions of the nozzle part.SOLUTION: An induction charging type electrostatic sprayer 1 includes a plurality of nozzle parts 3 which are aligned in one direction and jet a liquid as droplets, at least one electrode 5 extending in the one direction, and electrode support parts 6 for supporting at least the one electrode 5 so as to be brought into close contact with the outer periphery of a diffusion range of the droplets jet from each of the plurality of nozzle parts 3, and is configured to induce and electrify the droplets by applying a high voltage between the liquid and the electrode 5. The nozzle parts 3 are configured to jet the droplets while being diffused in substantially an elliptical shape having a major axis extending in the one direction.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction charging electrostatic spraying device that sprays a liquid such as a chemical using static electricity.

As a first background art, an induction charging type electrostatic spraying device described in Patent Document 1 is exemplified. As shown in FIG. 17, this induction charging type electrostatic spraying device 110 includes a pair of electrostatic spraying units 101, 101 for spraying left and right, respectively. The electrostatic spraying unit 101 includes a nozzle unit 111 that jets out droplets of liquid supplied through the jet pipe unit 142 , and a base end supported on the base end side of the nozzle unit 111 . an electrode support shaft 102 with a tip end extending toward the tip end of the nozzle part 111 at a distance of 111; It is provided with an electric leakage prevention part 104 provided on the creeping surface between the base end and the electrode 105, and is configured to induction-charge droplets by applying a high voltage between the liquid and the electrode 105.

As a second background art, an electrostatic spraying device described in Patent Document 2 is exemplified. As shown in FIG. 18, the high voltage supply circuit 202 in this electrostatic spraying device 201 supplies a high voltage generator 203 to each of electrodes 204a of a plurality of electrostatic spraying units 204 that eject countless charged droplets. supply high voltage from If each electrostatic spraying unit 204 is equipped with a heater 205 for drying the droplets in order to prevent electric leakage due to the droplets adhering thereto, the power supplied from the heater control circuit 207 to each heater 205 is the heater power. It also needs to be supplied by supply circuit 206 .

As a third background art, an electrostatic spraying device for agricultural vehicles described in Patent Document 3 is exemplified. As shown in FIG. 19, this electrostatic spraying device has rod-shaped front and rear high-voltage electrodes extending in the left-right direction below spray nozzles 303, . Conductors 361, 361 are arranged to apply a high voltage to the front and rear high voltage conductors 361, 361, and the front and rear high voltage conductors 361 located below the spray nozzles 303, ... of the spray boom 304. , 361 are formed into annular portions 361a, . configured to connect.

JP 2013-163154 A Japanese Patent Application Laid-Open No. 2007-130581 JP 2010-104321 A

In the apparatus according to the first background art, since each electrostatic spraying section 101 is provided with the electrode 105 supported via the electrode support shaft 102 having the leakage prevention section 104, the jet tube section 142 for supplying the liquid to the tip of the nozzle part 111 is long, and if it is configured to spray from one jet pipe part 142 to both sides, the distance from the center of the machine body to the tip of the nozzle part 111 increases, and as a result, the crops and There is a possibility that uneven application may occur due to the proximity of the nozzle portion 111 . Therefore, in this device, the two jet pipe sections 142 are arranged alternately to shorten the distance from the center of the machine body to the tip of the nozzle section 111 so as to prevent uneven application. are required, which complicates the configuration and increases the cost.

In addition, in the apparatus according to the second background art, each electrostatic atomizer 204 is provided with an electrode 204a. Wiring is required, and the wiring becomes more complicated and costly as the number of heads increases.

In contrast to this second background art, in the electrostatic spraying device according to the third background art, high-voltage conductors 361, 361 are provided as common electrodes for the plurality of spray nozzles 303, . In a portion of the high-voltage conductors 361, 361 close to the spray nozzle 303, annular portions 361a, . . . There is a problem that the number and relative positions of the spray nozzles 303, . . . are fixed and cannot be adjusted.

In any of the background arts, since the electrode is formed in an annular shape so that the inner circumference is close to the outer circumference of the diffusion range of droplets when the spray angle from the spray nozzle is maximum, the spray amount can be adjusted. If the spray angle is smaller than the maximum, the smaller the angle, the longer the distance between the droplets and the electrode, resulting in a problem that the charging efficiency of the droplets is lowered.

Furthermore, in the nozzle of the induction charging electrostatic spraying device, since the negative droplets are attracted to the positive electrode part, a phenomenon occurs in which the liquid consisting of the droplets drips from the nozzle. If a plurality of spray nozzles 303 in the electrostatic spraying device according to the third background art are vertically arranged and high-voltage conductors 361, 361 as common electrodes are vertically extended, The liquid droplets from all the spray nozzles 303 are absorbed by the common high-voltage conductor 361, and the liquid flows downward, and the liquid drips continuously downward at the lowest point, causing liquid leakage. A problem of giving such a bad impression arises. It should be noted that the amount of liquid that drips down in this way is about 2 to 3% of the amount of liquid that is sprayed, regardless of whether the electrodes are provided individually or in common. When the nozzles are provided in common, the liquid from the plurality of nozzles drips concentratedly at the lower end of the electrode, so the amount of liquid is felt to be larger than when the electrodes are provided individually.

In order to solve the above problems, the induction charging type electrostatic spraying device of the first invention includes:
a plurality of nozzles arranged in one direction for ejecting a liquid as droplets;
at least one electrode extending in the one direction;
an electrode supporting portion that supports the at least one electrode so as to be close to the outer periphery of the diffusion range of the droplets ejected from the plurality of nozzles;
An induction-charging electrostatic spraying device configured to induction-charge the droplets by applying a high voltage between the liquid and the electrodes,
The nozzle section is configured to diffuse and eject the liquid droplets in a substantially elliptical shape having a long axis extending in the one direction.

The electrode is not particularly limited, but may be one so as to be close to the outer periphery on one side of the diffusion range of the droplet, or to be close to the outer periphery on both sides of the diffusion range of the droplet. It is good also as two.

According to this configuration, the nozzle section is configured to diffuse and eject the liquid droplets in a substantially elliptical shape having a long axis extending in the one direction, which is the extending direction of the electrodes. The flatter the approximately elliptical shape (the longer the major axis relative to the minor axis of the approximately elliptical shape), the more (1) the jet from the nozzle section becomes more likely to be ejected in a circular shape. Since the range of increase and decrease in the spray angle in the short axis direction is small, the influence of the increase and decrease in the spray angle on the charging efficiency of the droplets is small. The electrode can be brought close to the outer periphery of the droplet diffusion range without the provision of the ring portion, and the number of the nozzle portions arranged in the one direction and the number of the nozzle portions The position can be flexibly adjusted.

As the induction charging type electrostatic spraying device of the second invention, in the first invention,
The nozzle section exemplifies a mode in which the ejection hole through which the droplet is ejected is provided at the tip of a small protrusion formed so as to protrude in the ejection direction of the droplet.

According to this configuration, the lines of electric force directed from the electrode to the nozzle can be concentrated on the small protrusion, and the droplets ejected from the ejection holes can be efficiently charged.

As the induction charging type electrostatic spraying device of the third invention, in the first or second invention,
A mode is exemplified in which the electrode has a surface extending in a direction substantially orthogonal to the ejection direction of the droplets of the nozzle section.

According to this configuration, it is possible to form an electric line of force extending linearly toward the nozzle portion from the entire surface extending in a direction substantially perpendicular to the ejection direction of the liquid droplet, and the liquid ejected from the nozzle portion. It is understood that droplets (especially those directed to the outside of said diffusion range) can be effectively charged.

As the induction charging type electrostatic spraying device of the fourth invention, in any one of the first to third inventions,
A mode is exemplified in which the electrode has a surface extending substantially parallel to the direction in which the droplets are ejected from the nozzle section.

According to this configuration, it is possible to form an electric line of force extending curvilinearly from the entire surface extending substantially parallel to the jetting direction of the droplets to the nozzle portion via the diffusion range of the droplets, It is understood that the droplets ejected from the nozzle portion (particularly those directed toward the inside of the diffusion range) can be effectively charged.

As the induction charging type electrostatic spraying device of the fifth invention, in any one of the first to fourth inventions,
The electrode support part is provided on the creeping surface between the electrode support side that supports the electrode and the opposite electrode support side, and has an earth leakage prevention part that prevents an earth leakage between the two support sides.

With this configuration, it is possible to prevent the potential of the electrode or the high-potential-side portion, which is the portion electrically connected thereto, from leaking through the electrode supporting portion.

As the induction charging type electrostatic spraying device of the sixth invention, in the fifth invention,
The leakage prevention part exemplifies a mode provided with a heater for drying the droplets adhering thereto.

According to this configuration, it is possible to prevent electric leakage from occurring due to a liquid film formed by accumulating the droplets.

As the induction charging type electrostatic spraying device of the seventh invention, in the fifth or sixth invention,
The plurality of nozzle sections includes a plurality of nozzle section sets, one of which sprays in one direction and the other of which sprays in the other direction in two opposite directions, and the plurality of nozzle sections. are arranged in a line in the one jetting pipe portion extending in the one direction, and configured to jet the liquid supplied through the jetting pipe portion as the droplets,
The electrode and its electrode supporting portion for the nozzle portion group that sprays in one of the two opposite directions, and the electrode and its electrode supporting portion for the nozzle portion group that sprays in the other direction are are arranged so as to have a substantially point-symmetrical positional relationship about the central axis when viewed from the direction of the central axis.

According to this configuration, it is possible to compactly arrange a plurality of nozzles for one jet pipe so as to jet in the two opposite directions. It is possible to suppress the occurrence of uneven coating.

As the induction charging type electrostatic spraying device of the eighth invention, in any one of the first to seventh inventions,
The one direction is a substantially vertical direction,
At a height midway between at least one pair of adjacent nozzles, the liquid falling along the electrodes is received and dropped into the spray ejected from the nozzles below. An embodiment including a drip-proof portion is illustrated.

The at least one set of adjacent nozzles is not particularly limited, but is exemplified to include a set of adjacent nozzles at the bottom. This is because the drip-proof portion can collect the largest amount of the liquid that drops along the electrodes. It may also be provided between adjacent nozzle sections higher up, so that the liquid can be dispersed over a plurality of drip-proof sections and collected in small amounts, thereby allowing it to fall into the spray. It becomes easy to mix in the spray when it is wet.

Although the height position in the middle is not particularly limited, it is preferably a position where it is difficult to come into contact with the spray ejected from the nozzles above and below. Moreover, the height position in the middle may be configured to be adjustable.

The material of the constituent elements of the drip-proof section is not particularly limited, but may be a hard material or a flexible material. If a flexible material is used, the adhesiveness to the electrodes is high, and the effect of collecting the liquid running along the electrodes can be enhanced.

According to this configuration, charged droplets ejected from the nozzle portion are attracted to the electrode and accumulated to become a liquid. Since it is configured to receive Since it is configured to be dropped, the liquid can be blown in the direction of the spray target together with the spray, and the liquid can be effectively used.

As the induction charging type electrostatic spraying device of the ninth invention, in the eighth invention,
The drip-proof portion has a base end portion attached to the electrode at a height position in the middle and receives the liquid from the electrode, at least one drop portion for dropping the liquid, and the drop portion from the base end portion. and a slope that allows the liquid to flow down to the part.

Although the base end portion is not particularly limited, an embodiment in which part or all of the liquid around the electrode is received is exemplified. It is not necessary to receive all of the liquid around the electrode, but it is preferable to receive all of the liquid because the effect of reducing waste of the liquid is greater.

Although the angle of the slope is not particularly limited, an aspect in which the slope is downward at 15 to 75° with respect to the horizontal direction is exemplified. This is because if the angle is smaller than 15°, the flow of the liquid becomes poor, and if the angle is larger than 75°, the liquid floats from the slope when the amount of the liquid is large, resulting in a guide action by the slope. This is because the Moreover, the angle of the slope may be configured to be adjustable.

The drop portion is not particularly limited, but examples include a mode in which the liquid is dropped from an edge portion of a member constituting the drop portion, and a mode in which the liquid is dropped from a hole provided in the member. A plurality of the falling portions may be provided in the drip-proof portion. As a result, the liquid can be dropped little by little by dispersing the liquid into a plurality of particles.

Further, as the drop portion, in a mode in which the liquid is dropped from the tip edge portion of the member constituting the drop portion, a mode is exemplified in which the width is narrowed toward the tip side. As a result, it can be made to drop intensively toward the target below.

With this configuration, the drip-proof portion according to the eighth invention can be realized with a simple configuration.

As the induction charging type electrostatic spraying device of the tenth invention, in the ninth invention,
Any one of the at least one drop portion is configured to drop the liquid just above the approximate center line of the spray ejected from the lower nozzle portion.

According to this configuration, the liquid collected by the drip-proof portion can be effectively sprayed in the direction of the target of spraying.

As the induction charging type electrostatic spraying device of the eleventh invention, in the ninth or tenth invention,
A mode is exemplified in which the slope is provided with a wall along its side edge for guiding the liquid to flow toward the falling portion.

According to this configuration, the wall allows the liquid to flow toward the falling portion without leakage.

As the induction charging type electrostatic spraying device of the twelfth invention, in any one of the ninth to eleventh inventions,
A mode is exemplified in which the inclined surface is provided with a concave portion or a convex portion that guides the liquid so as to flow toward the falling portion on the upper surface thereof.

According to this configuration, the flow of the liquid toward the falling portion can be controlled by the concave portion (eg, groove, concave point, etc.) or the convex portion (eg, ridge, convex point, etc.).

According to the induction-charging electrostatic spraying device according to the present invention, it is possible to reduce the influence of the increase or decrease in the spray angle on the charging efficiency of the droplets, and to flexibly adjust the number and positions of the nozzles. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the induction charging-type electrostatic spraying apparatus which concerns on 1st embodiment which actualized this invention. It is a figure which shows the same electrostatic spraying apparatus, (a) is a front view, (b) is a side view. It is a top view of the same electrostatic spraying apparatus. It is a plane sectional view of the same electrostatic spraying apparatus, (a) is a figure which shows the positional relationship of a spray nozzle and an electrode, (b) is a figure which shows the support structure of an electrode by an electrode support part. It is a circuit diagram concerning high voltage supply and heater control of the electrostatic spraying device. It is a perspective view of the induction charging-type electrostatic spraying device which concerns on 2nd embodiment which actualized this invention. It is a figure which shows the same electrostatic spraying apparatus, (a) is a front view, (b) is a side view. It is a top view of the same electrostatic spraying apparatus. It is a perspective view of the induction charging-type electrostatic spraying device which concerns on 3rd embodiment which actualized this invention. It is a figure which shows the same electrostatic spraying apparatus, (a) is a front view, (b) is a side view. It is a top view of the same electrostatic spraying apparatus. It is a perspective view of the induction charging-type electrostatic spraying apparatus which concerns on 4th embodiment which actualized this invention. It is the front view which expanded a part of the same electrostatic spraying apparatus. It is a top view of the same electrostatic spraying apparatus. It is an exploded perspective view of the drip-proof part of the electrostatic spraying device. It is a figure which shows the example of three modifications of the same drip-proof part. FIG. 2 is a plan view showing a pair of left and right electrostatic spraying units of the induction charging electrostatic spraying device according to the first background art; It is a circuit diagram of a high voltage supply circuit of an electrostatic spraying device according to the second background art. It is a figure which shows the electrostatic spraying apparatus of the agricultural vehicle based on the 3rd background art, (a) is a rear view, (b) is a top view.

1 to 5 show an induction charging type electrostatic spraying device 1 of a first embodiment embodying the present invention. This electrostatic spraying device 1 is installed at the front end of a machine body (not shown) configured to be able to run in a field. A plurality of nozzles 3 arranged in a vertical direction with respect to the jet tube 2 and ejecting the liquid as droplets, a plurality of electrodes 5 extending in the vertical direction, and ejected from the plurality of nozzles 3 respectively. An electrode supporting portion 6 supporting a plurality of electrodes 5 so as to be close to the outer circumference of the droplet diffusion range, a high voltage generating circuit 7 generating a high voltage, and applying the high voltage between the liquid and the electrodes 5. A high voltage cable 8 to be supplied, a heater control circuit 11 for controlling a heater 10 provided in a leakage prevention portion (described later) of the electrode support portion 6, and a heater control power output by the heater control circuit 11 10 and is arranged to inductively charge the droplets by applying a high voltage between the liquid and the electrode 5 . In addition, in each figure, the arrow F indicates the front side of the fuselage.

The plurality of nozzle units 3 include a plurality of nozzle unit sets, one of which sprays in one of two opposite directions (horizontal direction in this example) and the other of which sprays in the other direction. The plurality of (in this example, five) nozzle units are arranged in a single vertically extending jet pipe portion 2, and the liquid supplied through the jet pipe portion 2 is ejected as droplets. It is configured. The injection pipe portion 2 of this example is made of a conductive metal, and the liquid is connected to the ground through the injection pipe portion 2 . As shown in FIG. 4(a), each nozzle part 3 has an ejection hole 13 through which the droplet is ejected, provided at the tip of a small protrusion 14 formed so as to protrude in the ejection direction of the droplet. Through the ejection hole 13, droplets are diffused and ejected in a substantially elliptical shape having a long axis parallel to the vertical direction. Although the specific shape of the small protrusion 14 is not particularly limited, it has a substantially hemispherical shape with a diameter of 2.0 to 2.2 mm when viewed from the front of the nozzle portion 3 and a height of 1.2 to 1.4 mm when viewed from the same side. exemplifies the formation of In this example, the spray from the ejection hole 13 is at an angle of about 80° in the vertical direction (wide angle A1, see FIG. 2A) and at an angle of about 20° in the horizontal direction (narrow angle A2, FIG. 4A). ), whereby the droplets are dispersed in the substantially elliptical shape. The ratio between the wide angle A1 and the narrow angle A2 is preferably 4 or more, more preferably 8 or more. The reason for this is that if it is less than 4, the spray tends to come into contact with the electrode 5, and it is necessary to increase the distance between the electrode 5 and the nozzle portion 3 in order to prevent this. Also, when the spray direction is changed, the spray distance to the electrode 5 is likely to change. This is because setting the number to 8 or more makes it easier to keep the distance between the electrode 5 and the spray constant, and reduces the effect of changing the spray direction.

Two electrodes 5 are provided for each nozzle section group (in this example, five nozzle sections 3 constitute a nozzle section group) for spraying in each of the two opposite directions. As shown in FIG. 4(a), the two electrodes 5 for each nozzle section group are arranged on both sides of the diffusion range of droplets ejected from the nozzle section group in a plan view. As shown in 4(b), they are electrically connected by being linked by metal connection pieces 4 as conductors. Each electrode 5 is integrally formed on a first surface 5a of the nozzle portion 3 extending in a direction substantially orthogonal to the ejection direction of the liquid droplets, and on the nozzle portion side edge portion of the first surface 5a. It is formed to have a substantially L-shaped cross section having a second surface 5b extending substantially parallel to the jetting direction of the droplets. Although not particularly limited, in the configuration of the electrodes 5 of this example, as shown in FIG. The length L2 of the second surface 5b is set in the range of 5 to 15 mm, and the interval L3 between the second surfaces 5b of the two electrodes 5 is set in the range of 23 to 30 mm.

The electrode support portions 6 are attached to the upper and lower portions of the two electrodes 5 provided for each nozzle portion group, respectively, and support the two electrodes 5 with respect to the nozzle portion 2. is configured as Each electrode support portion 6 includes an electrode support side that supports the electrode 5 and a jet tube support side that is opposite to the electrode support side. A leakage prevention portion 16 is provided to prevent leakage. The earth leakage prevention portion 16 of this example is composed of an annular recess (not shown) extending so as to divide the creeping surface, and a cylindrical heater 10 mounted inside the annular recess. At least the surfaces of the components of are made of an electrically insulating material. The electrode support part 6 of this example is formed in a cylindrical shape from the electrode support side to the nozzle support side, and a high voltage cable 8 for supplying a high voltage to the electrode 5 can be wired in the cylinder. there is The leakage prevention unit 16 is provided with a heater 10 for drying the droplets adhering to it.

As shown in FIG. 3, two electrodes 5 and two electrode support portions 6 for the nozzle portion group that sprays in one of the two opposite directions, and two electrodes 5 for the nozzle portion group that sprays in the other direction. and the two electrode support portions 6 are arranged so as to have a substantially point-symmetrical positional relationship with respect to the central axis of the jet tube portion 2 (that is, in a plan view) when viewed from the direction of the central axis. It is

Next, the electrical system of the electrostatic spraying device 1 of this example will be described. As shown in FIG. A voltage cable 8 is arranged to be applied between the electrode 5 and the liquid. Electric power for heater control output from the heater control circuit 11 is supplied to each heater 10 via the heater cable 12 .

According to the induction charging type electrostatic spraying device 1 of the present example configured as described above, the nozzle part 3 is formed in a substantially elliptical shape having a long axis extending in the one direction, which is the direction in which the electrodes 5 extend. Since it is configured to diffuse and eject droplets, the flatter the approximately elliptical shape (the longer the major axis with respect to the minor axis of the approximately elliptical shape), the more circular the droplets are ejected. In comparison, (1) when the spray angle from the nozzle part 3 becomes small, the spread of the gap between the outer periphery of the diffusion range of the droplets and the electrode 5 is relatively small, and the charging efficiency of the droplets decreases. can be made relatively small, and (2) the electrode 5 can be brought close to the outer periphery of the droplet diffusion range even if the annular portion is not provided so as to be close to the outer periphery of the droplet diffusion range, Since the annular portion does not exist, the number of nozzle portions 3 arranged in one direction and the position of the nozzle portions 3 can be flexibly adjusted.

Further, the nozzle portion 3 has an ejection hole 13 through which the droplet is ejected, provided at the tip of a small projecting portion 14 formed so as to protrude in the ejection direction of the droplet. According to this configuration, the lines of electric force directed from the electrode 5 to the nozzle portion 3 can be concentrated on the small projection portion 14, and the droplets ejected from the ejection holes 13 can be efficiently charged.

Further, the electrode 5 has a first surface 5a extending in a direction substantially orthogonal to the direction in which the droplets are ejected from the nozzle portion 3 . According to this configuration, it is possible to form an electric line of force extending linearly toward the nozzle portion 3 from the entire first surface 5a extending in a direction substantially perpendicular to the jetting direction of the droplets. It is understood that the droplets that are in contact with the surface, particularly those directed to the outside of the diffusion range, can be effectively charged.

Further, the electrode 5 has a second surface 5 b that extends substantially parallel to the direction in which the droplets are ejected from the nozzle portion 3 . According to this configuration, an electric line of force is formed that extends curvilinearly from the entire second surface 5b extending substantially parallel to the jetting direction of the droplets and passing through the diffusion range of the droplets toward the nozzle portion 3. It is understood that the liquid droplets ejected from the nozzle portion 3 (especially those directed toward the inside of the diffusion range) can be effectively charged.

Further, the electrode supporting portion 6 is provided on the creeping surface between the electrode supporting side that supports the electrode 5 and the non-electrode supporting side, and is provided with an earth leakage preventing portion 16 that prevents electric leakage between the both supporting sides. According to this configuration, it is possible to prevent the potential of the electrode 5 or the high-potential-side portion, which is the portion electrically connected thereto, from leaking through the electrode support portion 6 .

Moreover, the earth leakage prevention part 16 exemplifies a mode provided with a heater 10 for drying the droplets adhering to it. According to this configuration, it is possible to prevent electric leakage from occurring due to a liquid film formed by accumulating the droplets.

Furthermore, the plurality of nozzle units 3 includes a plurality of nozzle subgroups, one of which sprays in one of the two opposing directions and the other of which sprays in the other direction. The sub-sets are arranged in a row in one jet pipe portion 2 extending in the one direction, and are configured to eject the liquid supplied through the jet pipe portion 2 as the droplets. The electrode 5 and its electrode supporting portion 6 for the nozzle portion group that sprays in one direction in two directions, and the electrode 5 and its electrode supporting portion 6 for the nozzle portion group that sprays in the other direction are arranged so as to have a substantially point-symmetrical positional relationship about the central axis when viewed from the direction of . According to this configuration, a plurality of nozzles 3 can be compactly arranged so as to jet out in the two opposite directions with respect to one jet pipe 2, so that the crops and the nozzles 3 are close to each other. By doing so, it is possible to suppress the occurrence of uneven coating.

Next, FIGS. 6 to 8 show a second embodiment embodying the present invention. This induction charging type electrostatic spraying device 51 mainly differs from the first embodiment in the following points. Accordingly, portions common to the same embodiment are given the same reference numerals to omit redundant description.

The electrostatic spraying device 51 of this example is attached to a handheld grip portion 52 and is configured to spray in one direction.

Five nozzle portions 3 as a nozzle portion group are arranged in the jet pipe portion 2 at intervals in the pipe length direction of the jet pipe portion 2 .

The electrode support part 6 is provided on one side of the tip end of the jet tube part 2 and on the side opposite to the one side on the base end of the jet tube part 2 .

The electrode 5 is composed of two metal rods as conductors, which are connected by metal connection pieces 53 as conductors on the distal end side and the proximal end side of the jet tube portion 2, respectively. Thus, they are physically integrated and electrically connected, and one electrode 5 on the distal end side of the jet pipe portion 2 and the other electrode 5 on the proximal end side of the jet pipe portion 2 are respectively electrodes. It is supported by the support portion 6 . In order to reduce the weight, the connecting piece 53 may be omitted and both electrodes 5 may be connected to the high voltage cables 8 respectively. 8, or connect the high voltage cable 8 to both electrodes 5 via the electrode support part 6 of either one.

An extended jet pipe portion 55 is connected to the proximal end side of the jet pipe portion 2 , and a grip portion 52 is provided on the proximal end side of the extended jet pipe portion 55 .

The same effects as in the first embodiment can be obtained with the induction charging type electrostatic spraying device 51 of this example.

Next, FIGS. 9 to 11 show a third embodiment embodying the present invention. This induction charging type electrostatic spraying device 61 mainly differs from the first embodiment in the following points. Accordingly, portions common to the same embodiment are given the same reference numerals to omit redundant description.

The electrostatic spraying device 61 of this example is provided with a pair of left and right shields 62 made of an electrically insulating material in front of the aircraft on which it is mounted. The shield 62 of this example is formed in the shape of a plate extending in the vertical direction, and the upper and lower portions thereof are supported by the nozzle portion 2 via mounting portions 62a. In addition, the shield 62 of this example is arranged with the normal direction of the plate surface inclined outward in the left-right direction with respect to the spray direction of the nozzle part 3 in a plan view, so that the front side of the electrode 5 (the side parallel to the spray direction of the nozzle portion 3) and the outer side of the electrode in the short axis direction of the substantially elliptical shape. The form of the shield 62 is not limited to this, and may cover only the front side of the electrode 5 (the side parallel to the spray direction of the nozzle portion 3), or cover the short axis direction of the substantially elliptical shape of the electrode 5. It may be configured to cover only the outer side. Due to this shield 62, when crops, weeds, etc. come into contact with the electrode 5 during spraying, the potential of the electrode 5 is lowered, and the potential difference between the electrode 5 and the liquid cannot be maintained, preventing electrostatic spraying. can be prevented. This makes it possible to achieve stable electrostatic spraying. The electrostatic spraying device 61 of this example is configured such that the nozzle portion 3 diffuses and ejects the liquid droplets in a substantially elliptical shape having a long axis extending in the vertical direction, and the horizontal direction is the substantially elliptical shape. Since the spray angle is narrowed in the short axis direction, the spread of the spray in the left and right direction in front of the electrode 5 is smaller than in the conventional circular spray. The shield 62 can be configured so as to shield the electrodes 5 more widely in the left-right direction, and the effect of preventing crops or the like from coming into contact with the electrodes 5 can be improved.

A pair of left and right electrodes 5 provided for the nozzle section group are physically integrated by connecting the upper end side and the lower end side to each other with connecting pieces 63 . Note that the connection piece 63 may be omitted for weight reduction.

With the induction charging type electrostatic spraying device 61 of this example as well, it is possible to obtain the same effects as those of the first embodiment, and also obtain the effects of the above-described configuration unique to this example.

Next, FIGS. 12 to 16 show a fourth embodiment embodying the present invention. This induction charging type electrostatic spraying device 71 mainly differs from the first embodiment in the following points. Accordingly, portions common to the same embodiment are given the same reference numerals to omit redundant description.

As shown in FIGS. 12 to 14, the induction charging type electrostatic spraying device 71 of the present example has the liquid falling along the electrodes 5 at a midway height position between two sets of adjacent nozzle portions 3. A drip-proof portion 72 is provided to receive L and drop it into the spray S ejected from the nozzle portion 3 below. According to this configuration, charged droplets ejected from the nozzle portion 3 are attracted to the electrode 5 and accumulate to become the liquid L. Since it is configured to receive L, it is possible to reduce the amount of liquid L that falls from the lower end of the electrode 5 to the ground or floor and is wasted. , the liquid L can be thrown in the direction of the target of spraying together with the spray S, and the liquid L can be effectively used.

One of the two sets of adjacent nozzle portions 3 is the set of adjacent nozzle portions 3 at the bottom. This is because the drip-proof portion 72 can recover the largest amount of the liquid L that drops along the electrodes 5 . The other of the two sets is a set of adjacent nozzle portions 3 above the one. This makes it possible to disperse the liquid L in the plurality of drip-proof portions 72 and collect it little by little.

The intermediate height position in this example is a substantially middle position between adjacent nozzle portions 3 . This is because the substantially intermediate position is a position where it is difficult to come into contact with the spray S ejected from the nozzle portions 3 above and below.

Although metal is used as a hard material for the material of the constituent elements of the drip-proof section 72 in this example, the material is not limited to this and may be a flexible material. By using a flexible material, the adhesiveness to the electrode 5 is high, and the effect of collecting the liquid L running along the electrode 5 can be enhanced.

The drip-proof portion 72 in this example includes a base end portion 73 that is attached to the electrode 5 at the middle height position and receives the liquid L from the electrode 5, a drop portion 74 that drops the liquid L, and the base end portion 73 that receives the liquid L from the electrode 5. and a slope 75 for causing the liquid L to flow down from the portion 73 to the falling portion 74 . In this example, as shown in FIGS. 14 and 15, the drip-proof portion 72 is formed by fixing two plate pieces 72a and 72b with two screws 72c as fixing means. are fixed to the electrodes 5 on both sides by screws 72d as fixing means. According to this configuration, the liquid L falling along the electrode 5 is received at a midway height position between the adjacent nozzle portions 3, and the liquid L is injected into the spray S ejected from the lower nozzle portion 3. The drip-proof portion 72 for directing and dropping can be realized with a simple configuration.

The base end portion 73 in this example is configured to receive the entire liquid L around the electrode 5, which is formed in a substantially L shape in plan view, at portions 73a, 73b, 73c, and 73d. It is not necessary to receive all the liquid L around the electrode 5, but it is preferable to receive all the liquid L as in the present embodiment because the effect of reducing the waste of the liquid L is increased.

The angle of the slope 75 in this example is set downward at 45° with respect to the horizontal direction. This is because, with this angle, both the ease of flow of the liquid L and the guiding action of the liquid L can be effectively achieved. The angle of the slope 75 may be configured to be adjustable.

Although the falling portion 74 in this example is the edge of the slope 75 on the tip side, it is not limited to this, and may be provided at a plurality of locations on the slope 75 . As a result, the liquid L can be dispersed little by little by being dispersed.

Also, the drop portion 74 in this example is formed to have a narrower width toward its tip end. As a result, the liquid L can be dropped intensively toward the target below.

Furthermore, the drop portion 74 in this example is configured to drop the liquid L just above the approximate center line of the spray S ejected from the nozzle portion 3 below. According to this configuration, the liquid L collected by the drip-proof portion 72 can be effectively blown in the direction of the spray target along with the spray.

Note that the drip-proof portion 72 can be modified as follows.
(a) A mode in which the slope 75 is provided with a wall 75a along its side edge for guiding the liquid to flow toward the drop portion 74 (see FIG. 16(a)). According to this configuration, the wall 75a allows the liquid L to flow toward the drop portion 74 without leakage.

(b) An aspect is exemplified in which the inclined surface 75 is provided with a concave portion or a convex portion that guides the liquid L so as to flow toward the falling portion 74 on its upper surface (see FIG. 16(b)). In the figure, it is assumed that a concave groove as a concave portion or a ridge as a convex portion is provided at a position indicated by a chain double-dashed line in the center of the slope 75 . Alternatively, the concave groove may be formed by bending the position indicated by the chain double-dashed line in the figure into a V shape. According to this configuration, the flow of the liquid L toward the falling portion 74 can be controlled by the concave portion or the convex portion.

(c) In an electrostatic spraying device in which one electrode 5 is provided for a plurality of nozzle portions 3 arranged in a vertical direction, the drip-proof portion 72 of this example is divided into two at the center. A mode in which the electrode 5 is equipped with the drip-proof portion 72A (see FIG. 16(c)). This configuration also provides the same effects as the drip-proof portion 72 of this example.

With the induction charging type electrostatic spraying device 71 of this example configured as described above, it is possible to obtain the same effects as those of the first embodiment, and also to obtain the effects of the above-described configuration unique to this example. . According to the electrostatic spraying device 71 of the present embodiment, the amount of the liquid L dripping downward from the lower end of the electrode 5 can be reduced to about 0.2% of the amount of the liquid to be sprayed due to the function and effect of the drip-proof portion 72. did it.

It should be noted that the present invention is not limited to the above-described embodiments, and can be embodied with appropriate modifications within the scope of the invention, for example, as described below.
(1) A configuration in which one electrode 5 is provided for each nozzle section group. One electrode 5 for each nozzle section group is arranged only on one side of both sides of the diffusion range of droplets ejected from the nozzle section group in a plan view. FIG. 16(c) is a partially enlarged view showing the positional relationship between the nozzles 3 and the electrodes 5 when the nozzles 3 are arranged in a row in the vertical direction.
(2) To appropriately increase or decrease the number of electrode support portions 6 that support the electrodes 5 .
(3) changing the shape of the electrode 5 as appropriate; For example, it may be formed in a rectangular shape (hollow or solid) in plan view, or may have only a surface extending in a direction substantially orthogonal to the ejection direction of the droplets of the nozzle portion 3, or the liquid of the nozzle portion 3 may be formed. For example, it may have only a surface extending substantially parallel to the ejection direction of the droplet.

REFERENCE SIGNS LIST 1 induction charging type electrostatic spraying device 2 ejection pipe portion 3 nozzle portion 4 connection piece 5 electrode 5a first surface 5b second surface 6 electrode support portion 7 high voltage generation circuit 8 high voltage cable 10 heater 11 heater control circuit 12 heater cable 13 Ejection hole 14 Small protrusion 16 Leakage prevention part 51 Inductive charging type electrostatic sprayer 52 Grip part 53 Connection piece 55 Extension ejection pipe part 61 Induction charging type electrostatic spraying device 62 Shield 62a Mounting part 63 Connection piece 71 Inductive charging type electrostatic spray device 72 drip-proof portion 72A drip-proof portion 72a plate piece 72b plate piece 72c screw 72d screw 73 base end portion 73a portion for receiving liquid 73b portion for receiving liquid 73c portion for receiving liquid 73d portion for receiving liquid 74 falling portion 75 slope 75a wall A1 wide angle A2 narrow angle L liquid S spray

Claims (12)

a plurality of nozzles arranged in one direction for ejecting a liquid as droplets;
at least one electrode extending in the one direction;
an electrode supporting portion that supports the at least one electrode so as to be close to the outer periphery of the diffusion range of the droplets ejected from the plurality of nozzles;
An induction-charging electrostatic spraying device configured to induction-charge the droplets by applying a high voltage between the liquid and the electrodes,
The nozzle part is an induction-charging electrostatic spraying device configured to diffuse and eject the droplets in a substantially elliptical shape having a long axis extending in the one direction. 2. The induction-charging electrostatic discharge device according to claim 1, wherein the nozzle section has an ejection hole through which the droplet is ejected, provided at the tip of a small protrusion formed so as to protrude in the ejection direction of the droplet. spraying device. 3. The induction charging electrostatic spray device according to claim 1, wherein the electrode has a surface extending in a direction substantially orthogonal to the jetting direction of the droplets of the nozzle portion. The induction charging type electrostatic spraying device according to any one of claims 1 to 3, wherein the electrode has a surface extending substantially parallel to the jetting direction of the droplets of the nozzle portion. 5. The electrode support part according to any one of claims 1 to 4, wherein the electrode support part is provided on a creeping surface between an electrode support side that supports the electrode and a non-electrode support side, and has an earth leakage prevention part that prevents an earth leakage between the two support sides. The induction charging type electrostatic spraying device according to item 1. 6. The induction charging type electrostatic spraying device according to claim 5, wherein the leakage prevention unit has a heater for drying the droplets attached thereto. The plurality of nozzle sections includes a plurality of nozzle section sets, one of which sprays in one direction and the other of which sprays in the other direction in two opposite directions, and the plurality of nozzle sections. are arranged in a line in the one jetting pipe portion extending in the one direction, and configured to jet the liquid supplied through the jetting pipe portion as the droplets,
The electrode and its electrode supporting portion for the nozzle portion group that sprays in one of the two opposite directions, and the electrode and its electrode supporting portion for the nozzle portion group that sprays in the other direction are 7. The induction charging type electrostatic spraying device according to claim 5 or 6, which is arranged so as to have a substantially point-symmetrical positional relationship about the central axis when viewed from the direction of the central axis. The one direction is a substantially vertical direction,
At a height midway between at least one pair of adjacent nozzles, a drip-proof device receives the liquid falling along the electrodes and drops it into the spray ejected from the lower nozzles. The induction charging type electrostatic spraying device according to any one of claims 1 to 7, comprising a part. The drip-proof portion has a base end portion attached to the electrode at a height position in the middle and receives the liquid from the electrode, at least one drop portion for dropping the liquid, and the drop portion from the base end portion. 9. The induction charging type electrostatic spraying device according to claim 8, further comprising an inclined surface for causing the liquid to flow down to the portion. 10. The induction charging electrostatic discharge device according to claim 9, wherein any one of said at least one drop portion is configured to drop said liquid just above a substantially center line of the spray ejected from said lower nozzle portion. electrospray device. 11. The induction-charging electrostatic spraying device according to claim 9, wherein the inclined surface is provided with a wall along a side edge thereof for guiding the liquid so as to flow toward the falling portion. The induction charging electrostatic spray according to any one of claims 9 to 11, wherein the inclined surface is provided with a concave portion or a convex portion that guides the liquid so as to flow toward the falling portion on the upper surface. Device.

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