JP2006015293A - Electrode part for electrostatic atomization - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode part for electrostatic atomization with which an electrostatic atomizing function of electrifying liquid droplets to be jetted from a spray nozzle can easily be added at a low cost to an atomizer having no electrostatic atomizing function. <P>SOLUTION: The electrode part 1 for electrostatic atomization is fit to the atomizer 10 having the spray nozzle 12 for jetting a liquid as countless liquid droplets D to add the electrostatic atomizing function of electrifying liquid droplets D to the atomizer 10. This electrode part 1 for electrostatic atomization is provided with: an electrode supporting part 2 the base end side of which is fit to the atomizer 10 and which has an electrical insulating property; and a circular electrode 3 which is supported on the tip side of the electrode supporting part 2 and used for electrifying liquid droplets D so that liquid droplets D are electrified by high voltage to be impressed between the liquid to be jetted and the circular electrode 3. An electric leak preventing part 4 for preventing the electrical potential of the circular electrode 3 from leaking to the electrode supporting part 2 is arranged in an intermediate part 5 of the electrode supporting part 2 between the circular electrode 3 and the atomizer 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrode portion for electrostatic spraying for charging droplets ejected from a spray nozzle of a spraying device.

  As an example of a conventional electrostatic spraying device, an electrostatic chemical spraying device disclosed in Patent Document 1 is exemplified. This apparatus uses a back-powered sprayer that is carried on the back of an operator. As shown in FIG. 5, an electrode 82 is provided on the nozzle 81 for charging a conductive chemical solution, and a high voltage is applied to the electrode. Is provided with a high voltage generator 83 for applying the voltage.

Japanese Utility Model Publication No. 6-41641

  However, in the conventional electrostatic spraying device, in particular, the nozzle 81 and the electrode 82 have a unique structure, and a combination of both having the unique structure is configured to exert an electrostatic function. For this reason, if the structure for the electrostatic function in the conventional electrostatic spraying device is to be used for an existing spraying device that does not have an electrostatic function, at least the spray nozzle portion of the existing spraying device. There is a problem that it is necessary to replace the whole with the nozzle 81 and the electrode 82, and costs increase.

  In addition, since the chemical solution is prepared to have permeability and spreadability in order to adhere efficiently to the crop, the spray of the chemical solution is not limited to the electrode 82 of the jet head 81 but also the air pipe 84 and the chemical solution hose 85. It adheres well to the surface and accumulates. Further, since the electrode 82 is positively charged and the spray is negatively charged, the negatively charged spray is attracted and attached to the positive electrode 82 and is accumulated. In particular, when continuous spraying is performed for a long time, a continuous film of the chemical solution is formed from the nozzle 81 to the blower pipe 84 and the chemical solution hose 85. As described above, since the chemical solution has conductivity, the high voltage of the electrode 82 is transmitted to the back negative power sprayer side (operator side) through this continuous film. For this reason, for example, if an operator's hand touches this continuous film, or if this continuous film reaches the grounded part of the electrostatic spraying device, a leakage occurs, and an excessive current is generated in the high voltage generator 83. There is a problem that a sufficient electrostatic effect cannot be obtained.

In order to solve the above problems, the electrode part for electrostatic spraying of the present invention is:
An electrode unit for electrostatic spraying, which is attached to a spraying device having a spray nozzle that ejects liquid into countless liquid droplets and adds an electrostatic function for charging the liquid droplets to the spraying device,
An electrode support having a base end attached to the spraying device and having electrical insulation;
An electrode that is supported on the tip side of the electrode support portion and charges the droplet;
The droplet is charged by a high voltage applied between the liquid and the electrode.

  According to this configuration, the electrostatic function can be easily applied to the spray device by attaching the base end side of the electrode support portion to the spray device and applying a high voltage between the spray nozzle and the liquid. Can be added. In addition, since the electrostatic spray electrode section of the present invention has a simple structure, it can be realized at low cost.

  The aspect in which the electrical leakage prevention part which prevents the electric potential of the said electrode from passing through this electrode support part and leaking in the middle part from the said electrode in the said electrode support part to the said spray apparatus is illustrated.

  According to this configuration, since the leakage prevention portion is provided in the electrode support portion, a high voltage can be reliably applied between the spray nozzle and the liquid, and the electrostatic function can be stabilized. Can be demonstrated.

  The said earth leakage prevention part illustrates the aspect provided with the annular recessed part over the perimeter of the said middle part of the said electrode support part.

  According to this configuration, since the droplets are difficult to enter inside the annular recess of the leakage prevention unit, the continuous film due to the adhesion of the droplets to the electrode support unit is interrupted by the annular recess. can do. Thereby, it is possible to prevent the high potential of the electrode from being transmitted to the spraying device side through the conductive droplet.

  The leakage prevention part exemplifies a mode in which the depth of the annular recess extends in the extending direction of the intermediate part.

  According to this configuration, it is possible to ensure a large depth of the annular recess while suppressing an increase in the size of the leakage prevention portion, and it is more difficult for the droplets to adhere to the back side of the annular recess. For this reason, the continuous film | membrane of the said droplet to the said electrode support part can be more reliably interrupted by the said annular recessed part.

  The leakage prevention part is exemplified by an aspect in which the opening of the annular recess is open in the extending direction of the midway part, and has a flange part that confronts the opening and narrows the opening of the opening. .

  According to this configuration, when the liquid droplets adhering to the electrode or the electrode support portion accumulate and flow to the leakage prevention portion side, it can be prevented from flowing into the annular recess, It is possible to prevent the droplets floating in the annular recess from entering.

  The said electrode support part illustrates the aspect comprised so that the said electrode was cantilevered.

  According to this configuration, since it has a simple structure, it can be realized at low cost.

  The said electrode support part illustrates the aspect attached to the said spraying device so that attachment or detachment was possible.

  According to this configuration, it can be appropriately attached to and detached from the spraying device as necessary.

  According to the electrode unit for electrostatic spraying according to the present invention, an electrostatic spraying function can be easily and inexpensively added to a spraying device that does not have an electrostatic function for charging droplets ejected from the spray nozzle. There is an excellent effect of being able to.

  1 to 3 show a spray device 10 equipped with an electrostatic spray electrode unit 1 according to a first embodiment embodying the present invention.

  The spraying device 10 includes a jet tube 11 that sends a chemical liquid pressurized by a pump (not shown), and a spray nozzle 12 that is attached to the tip of the jet tube 11 and jets a spray S composed of liquid chemical droplets D. Yes. The spray nozzle 12 is formed of a conductive material in this example, but is not limited thereto, and a spray nozzle 12 formed of plastic or ceramic can be appropriately employed.

  The electrode part 1 for electrostatic spraying is for adding an electrostatic function for charging the droplet D to the spraying device 10, and the base end side is attached to the jet tube 11 of the spraying device 10, and has electrical insulation. And an annular electrode 3 as an electrode for charging the droplet D, which is supported on the tip side of the electrode support 2. The middle portion 5 of the electrode support 2 from the annular electrode 3 to the tube 11 is provided with a leakage prevention portion 4 that prevents the potential of the annular electrode 3 from leaking through the electrode support 2. Yes. The electrostatic spraying electrode unit 1 is configured to charge the droplet D with a high voltage applied between the chemical solution and the annular electrode 3. A method of applying a high voltage between the chemical solution and the annular electrode 3 is not particularly limited, but a conductive portion (spray nozzle 12, a chemical solution supply pipe formed of a conductive material, a chemical solution tank, etc.) in contact with the chemical solution, An example of applying a high voltage between an electrode or the like immersed in a chemical solution and the annular electrode 3 will be described.

  The tip end side of the electrode support 2 is cantilevered so that the inner peripheral edge of the annular electrode 3 is close to the outside of the diffusion range of the droplet D ejected from the spray nozzle 12. It is configured. Moreover, the base end side of the electrode support part 2 is attached to the injection tube 11 of the spraying apparatus 10 so that attachment or detachment is possible. In this example, one end side of the attachment belt 2b having flexibility is attached to the electrode support part main body 2a on the base end side of the electrode support part 2. Then, the attachment belt 2b is wrapped around the jet tube 11 without slack, and is fixed to the electrode support body 2a with screws 2c as fixing means, so that the attachment belt 2b is detachably attached to the jet tube 11.

  The annular electrode 3 is made of an annular plate material made of a conductive material. The surface and the outer peripheral edge of the annular electrode 3 on the side opposite to the spray nozzle are covered with a cover 3a having electrical insulation.

  The leakage preventing portion 4 is formed integrally with the annular portion 6 attached to the outer periphery of the intermediate portion 5 of the electrode support portion 2 and the outer peripheral edge portion of the annular portion 6 and extends to both sides in the extending direction of the intermediate portion 5. A cylindrical portion 7 and a pair of flange portions 8 respectively mounted on the outer periphery of the midway portion 5 are provided so as to confront each opening portion 7a of the cylindrical portion 7 and narrow the opening of each opening portion 7a. The flange portion 8 is formed in a flange shape protruding in the radial direction over the entire outer periphery of the midway portion 5. In addition, the annular portion 6 and the collar portion 8 are mounted in close contact with the outer periphery of the midway portion 5 so that the chemical solution does not pass therethrough. Thus, between the middle part 5 of the electrode support part 2 and the cylinder part 7, annular recesses 9, 9 are formed over the entire outer periphery of the middle part 5. The annular recesses 9, 9 have respective openings 7 a, 7 a that open in the extending direction of the intermediate part 5, and the depth extends in the extending direction of the intermediate part 5.

  Moreover, the leakage prevention part 4 can also be changed as follows, for example.

(1) As shown in FIG. 3A, an annular portion 20 attached to the outer periphery of the middle portion 5 of the electrode support portion 2 and an intermediate portion 5 formed integrally with the outer peripheral edge of the annular portion 20. The outer periphery of the intermediate portion 5 so as to narrow the opening of the cylindrical portion 21 facing the opening 21a of the cylindrical portion 21 and the opening 21a of the cylindrical portion 21. The earth leakage prevention part 4 is configured so as to have the flange part 8 attached to. Also in this configuration example, an annular recess 9 is formed between the middle portion 5 of the electrode support portion 2 and the cylindrical portion 21 over the entire outer periphery of the middle portion 5. In the annular recess 9, the opening 21 a opens in the extending direction of the midway portion 5, and the depth extends in the extending direction of the midway portion 5. In addition, as shown by a two-dot chain line in FIG. 3A, for example, an annular surface having an outer peripheral surface facing the inner peripheral surface of the cylindrical portion 21 is provided on the opposing surface of the cylindrical portion 21 to the opening portion 21a. By providing the convex portion 22, it is possible to further make it difficult for the droplet D to enter the inside of the cylindrical portion.

(2) As shown in FIG. 3B, the leakage preventing portion 4 is configured to include a plurality of (three in this example) flanges 8 arranged in the extending direction of the midway portion 5. To do. Also in this configuration, an annular recess 9 is formed between the adjacent flanges 8. Moreover, although the earth leakage prevention part 4 may be comprised so that the one collar part 8 may be provided, the cyclic | annular recessed part 9 is not formed in this structure.

  In such a configuration, the droplet D ejected from the spray nozzle 12 is induction-charged. In this example, a DC positive voltage is applied to the annular electrode 3 with respect to the chemical solution, and the droplet D is inductively charged at the tip of the spray nozzle 12.

  According to the electrode part 1 for electrostatic spraying of the present example configured as described above, the base end side of the electrode support part 2 is attached to the spraying device 10 and a high voltage is applied between the drug solution and the annular electrode 3. Thus, the electrostatic function can be easily added to the spray device 10. In addition, since the electrode part 1 for electrostatic spraying according to the present invention has a simple configuration, it can be realized at low cost.

  Moreover, since the leakage prevention part 4 is provided in the electrode support part 2, a high voltage can be reliably applied between a chemical | medical solution and the annular electrode 3, and an electrostatic function can be exhibited stably. .

  In addition, the leakage prevention unit 4 includes an annular recess 9 that extends over the entire circumference of the middle portion 5 of the electrode support 2. For this reason, it is difficult for the droplets D to enter the inside of the annular recess 9 of the leakage prevention unit 4, so that the continuous film M due to the adhesion of the droplets D to the electrode support unit 2 is interrupted by the annular recess 9. Can do. Thereby, it is possible to prevent the high potential of the annular electrode 3 from being transmitted to the spray device 10 side through the conductive droplet D.

  Further, as in the configuration example other than the above (2), when the leakage preventing portion 4 is configured such that the depth of the annular recess 9 extends in the extending direction of the intermediate portion 5, the leakage preventing portion 4 is increased in size. While suppressing, the depth of the annular recess 9 can be secured widely, and the droplet D is more difficult to adhere to the back side of the annular recess 9. For this reason, the continuous film M of the droplet D to the electrode support part 2 can be more reliably interrupted by the annular recess 9.

  Further, as in the configuration example other than the above (2), the leakage preventing portion 4 has the opening of the annular recess 9 opened in the extending direction of the intermediate portion 5 and the opening facing the opening. If it comprises so that the collar part 8 which narrows opening of a part may be provided, when the droplet D adhering to the annular electrode 3 or the electrode support part 2 accumulates and flows into the leakage prevention part 4 side, it will enter in the annular recessed part 9 It is possible to prevent the liquid droplets D from floating into the annular recess 9 and to prevent the liquid droplets D from flowing into the annular recess 9.

  Further, the electrode support portion 2 is configured to support the annular electrode 3 in a cantilever manner, and since it has a simple structure, it can be realized at low cost.

  Moreover, since the electrode support part 2 is attached to the spraying apparatus 10 so that attachment or detachment is possible, it can be suitably attached or detached to the spraying apparatus 10 as needed.

  Next, FIG. 4 shows a second embodiment that embodies the present invention. The electrode part 30 for electrostatic spraying is configured such that the proximal end side of the electrode support part 31 is detachably attached to a part 35 other than the injection tube 11 in the spraying apparatus 10 with screws 32 as fixing means. This is mainly different from the first embodiment. Accordingly, portions common to the embodiment are given the same reference numerals, and redundant description is omitted. The effect similar to 1st embodiment can be acquired also by the electrode part 30 for electrostatic spraying of this example.

In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) The present invention is configured to be applicable to a spraying device having another structure. For example, the electrode support portion 2 is configured to be attachable to the linearly extending jet tube 11 instead of the jet tube 11 having the tip portion formed in an L shape as in this example.
(2) The support structure of the annular electrode 3 by the electrode support portion 2 is appropriately changed to a structure other than the cantilever support.

It is a sectional side view of the spraying device equipped with the electrode part for electrostatic spraying concerning a first embodiment which materialized the present invention. It is II arrow directional view of FIG. It is a sectional side view of the example of a change of the earth-leakage prevention part in the electrode part for electrostatic spraying, (a) is a figure which shows a 1st modification and (b), respectively, a 2nd modification. It is a sectional side view of the electrostatic spraying apparatus which concerns on 2nd embodiment which actualized this invention. It is a sectional side view of the conventional electrostatic spraying apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode part for electrostatic spraying 2 Electrode support part 3 Ring electrode 4 Earth leakage prevention part 5 Middle part 6 Ring part 7 Tube part 7a Opening part 8 Gutter part 9 Ring-shaped recessed part 10 Spraying device 11 Spray tube 12 Spray nozzle 20 Ring part 21 cylindrical part 21a opening part 22 annular convex part 30 electrode part 31 for electrostatic spraying electrode support part D droplet M continuous film S spraying

Claims (7)

An electrode unit for electrostatic spraying, which is attached to a spraying device having a spray nozzle that ejects liquid into countless liquid droplets and adds an electrostatic function for charging the liquid droplets to the spraying device,
An electrode support having a base end attached to the spraying device and having electrical insulation;
An electrode that is supported on the tip side of the electrode support portion and charges the droplet;
An electrode unit for electrostatic spraying configured to charge the droplets with a high voltage applied between the liquid and the electrode.   The electrostatic discharge prevention part of Claim 1 with which the electrical potential of the said electrode was prevented from leaking through the electrode support part in the middle part from the said electrode in the said electrode support part to the said spraying apparatus. Electrode unit for spraying.   The electrode part for electrostatic spraying according to claim 2, wherein the leakage preventing part includes an annular recess extending over the entire circumference of the intermediate part of the electrode support part.   The electrode part for electrostatic spraying according to claim 3, wherein the leakage prevention part has a depth of the annular recess extending in an extending direction of the middle part.   The leakage prevention portion includes an eaves portion in which the opening portion of the annular recess is open in the extending direction of the intermediate portion and the opening portion of the opening portion is narrowed against the opening portion. The electrode part for electrostatic spraying of 4.   The electrode part for electrostatic spraying according to any one of claims 1 to 5, wherein the electrode support part is configured to cantilever-support the electrode.   The electrode part for electrostatic spraying according to any one of claims 1 to 6, wherein the electrode support part is detachably attached to the spraying device.

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