JP2013034909A - Induction charge type electrostatic spray device and electrode part structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of leakage of electricity and to prevent the damage when shock is given.SOLUTION: The electrode part structure 1 is equipped in a nozzle part 11 for jetting a liquid, supplied from a base end part side, as droplets D from a tip part and is provided with: a shaft-like electrode support shaft 2 having a tip part extended to the tip part side of the nozzle part 11 at an interval in the lateral side from the nozzle part 11 while supporting a base end part in the base end part side of the nozzle part 11; and a nearly annular electrode 5 arranged in the tip part of the electrode support shaft 2 and formed to allow the inner periphery to be close to the outer periphery of a dispersed range of the droplets D; wherein the droplets D is induction-charged by applying high voltage between the liquid and the electrode 5. The electrode support shaft 2 has a base end part supported freely detachably to the base end part side of the nozzle part 11 through a holding part 6. When prescribed external force is applied to the tip part of the electrode support shaft 2, the holding part 6 is structured to cancel the support of the base end part of the electrode support shaft 2 by the force.

Description

  The present invention relates to an induction charging type electrostatic spraying apparatus that sprays a liquid such as a chemical solution using static electricity and an electrode part structure thereof.

  As an electrode part structure of the conventional induction charging type electrostatic spraying apparatus, the structure of the nozzle hole 110 described in Patent Document 1 is exemplified. As shown in FIG. 8, the nozzle hole 110 is detachable from the nozzle holder 112, a nozzle holder 112 that supports the nozzle 111, a joint 113 that connects the nozzle holder 112 to a nozzle tube (not shown), and the nozzle holder 112. A nozzle cover 114 that covers the periphery of the nozzle 111, and a rear cover 115 that is attached to the proximal end side of the nozzle holder 112.

  The nozzle cover 114 is made of a non-conductive material and has a substantially cylindrical shape. The peripheral wall of the nozzle cover 114 is provided with a plurality of ventilation windows 114a penetrating inside and outside the peripheral wall. The front end side of the nozzle cover 114 is disposed so that the inner periphery is close to the outer periphery of the diffusion range of the droplet D, and the surface is covered with a continuous film S of liquid by the droplet D adhering during spraying. An annular portion 117 is formed so as to allow it to be broken.

  A plate-like conductor 118 extending in the length direction (circumferential width direction) of the nozzle cover 114 is disposed on the inner peripheral surface of the nozzle cover 114. The surface of the conductor 118 is a conductive surface exposed so as to be in contact with the continuous film S. A high voltage (relative high voltage with respect to the liquid supplied to the nozzle 111) generated by a high voltage generator (not shown) is applied to the conductor 118 via the high-voltage lead wire 104 and the contact shaft 105. It is like that.

JP 2009-131772 A

  By the way, in the conventional electrode part structure, the high potential part for inductively charging the droplet D is the tip side of the nozzle cover 114. Since the entire inner circumference of the base end of the nozzle cover 114 is firmly supported by the entire circumference of the outer circumference of the nozzle holder 112, even if an impact is applied to the nozzle cover 114 including the high potential portion, There is an advantage that the nozzle holder 112 supporting itself or the nozzle holder 112 is not easily damaged.

  However, in the conventional electrode structure, when spraying is started, the nozzle cover 114 is gradually covered with the liquid continuous film S and gradually becomes a high potential, not only at the tip side. For this reason, when the nozzle cover 114 touches an earth potential object such as a crop during work, there is a problem that electric leakage is likely to occur and the droplet D is not induced and charged due to electric leakage.

In order to solve the above problems, the electrode part structure of the induction charging electrostatic spraying device of the present invention is:
It is equipped with a nozzle part that ejects liquid supplied from the base end side as droplets from the tip part,
A shaft-like electrode support shaft in which the base end portion is supported on the base end portion side of the nozzle portion, and the tip end portion extends to the tip end side of the nozzle portion at a lateral interval from the nozzle portion. And an approximately annular electrode disposed at the tip of the electrode support shaft and formed so that the inner periphery is close to the outer periphery of the diffusion range of the droplet, and a high gap is provided between the liquid and the electrode. In the electrode part structure of the induction charging type electrostatic spraying device which is configured to induce charging of the droplet by applying a voltage,
The electrode support shaft is supported so that the base end portion thereof is detachably attached to the base end side of the nozzle portion via a holding portion,
The holding portion is configured such that when the distal end portion of the electrode support shaft receives a predetermined external force, the support of the base end portion of the electrode support shaft is released by the force.

  The predetermined external force is not particularly limited, but can be directly or indirectly applied to the electrode support shaft. Further, the predetermined external force is exemplified by a bending moment or / and a torsional moment exceeding a predetermined strength in a predetermined direction with respect to the electrode support shaft.

According to this configuration, even if the surface of the electrode support shaft is covered with a continuous film of liquid that continues from the electrode and has a high potential after spraying starts, the electrode support shaft is formed in an axial shape and the nozzle portion Therefore, it is less likely to touch a ground potential object than the conventional electrode structure in which the high potential portion exists all around the outer periphery of the nozzle portion, and the occurrence of electrical leakage can be greatly reduced. it can.
The holding portion that supports the electrode support shaft is configured to release the support of the base end portion of the electrode support shaft when receiving a predetermined external force at a distal end portion of the electrode support shaft. For this reason, when an impact is applied to the electrode or the electrode support shaft, the electrode, the electrode support shaft, the holding portion, the nozzle portion, or the like can be prevented from being damaged.

As an electrode part structure of the induction charging type electrostatic spraying device,
The holding portion includes a plurality of holding pieces,
The plurality of holding pieces can be engaged with each other so as to hold the outer periphery of the electrode support shaft and receive the predetermined external force at the tip of the electrode support shaft in the held state. And an embodiment in which the mutual engagement is released by the force thereof.

  According to this configuration, when a predetermined external force is applied to the distal end portion of the electrode support shaft, a configuration in which the support of the base end portion of the electrode support shaft is released by the force is realized with a simple structure and at a low cost. Can do.

  The holding piece exemplifies a mode in which the holding piece can be connected to other parts of the electrostatic spraying device so as to be relatively movable via a string-like body for preventing scattering.

  According to this configuration, it is possible to prevent the holding pieces from scattering when the holding pieces are released from each other.

Moreover, the induction charging electrostatic spraying device of the present invention is
Either of the left-right paired nozzle part which ejects the liquid supplied from a base end part as a droplet from a front-end | tip part, and the side in the left-right direction of both these nozzle parts are each equipped with either. Comprising the electrode part structure according to one item,
When the holding portion receives an external force having a predetermined strength from a direction orthogonal to the arrangement direction of the two nozzle portions as the predetermined external force, the holding portion supports the base end portion of the electrode support shaft by the force. Is configured to be released.

  This induction charging type electrostatic spraying device is a two-headed mouth type having two each of the nozzle part and the electrode part structure. In this type of two-headed mouth type, if both nozzle portions are moved in a direction orthogonal to the direction in which the two nozzle portions are arranged, it is possible to efficiently spray over a wide range with a small amount of movement. For this reason, during spraying, the nozzles are most likely to move in this direction of movement, so the external force applied to the electrode support shaft is most likely to be from this direction. Therefore, in this configuration, the effect of the electrode portion structure is stabilized by matching the direction of the external force that releases the support of the base end portion of the electrode support shaft with the most likely moving direction. It is designed to be able to demonstrate it properly and reliably.

  According to the induction charging type electrostatic spraying apparatus and the electrode part structure thereof according to the present invention, it is possible to reduce the occurrence of electric leakage and to achieve an excellent effect of preventing damage when an impact is applied.

It is a perspective view which shows the nozzle part and electrode part structure of the induction charging type electrostatic spraying apparatus which concerns on 1st embodiment which actualized this invention. It is a top view of the nozzle part and electrode part structure of the apparatus. It is a bottom view of the nozzle part and electrode part structure of the apparatus. It is a plane sectional view of the nozzle part and electrode part structure of the device. It is sectional drawing of the nozzle part and electrode part structure of the apparatus, (a) is Va-Va sectional drawing of FIG. 2, (b) is Vb-Vb sectional drawing of FIG. It is a figure which shows the 2nd holding piece in the holding | maintenance part of the same electrode part structure, (a) is a top view, (b) is the bb line | wire end view of (a), (c) is c of (a). FIG. It is a figure which shows the nozzle part and electrode part structure of the induction charging type electrostatic spraying apparatus which concerns on 2nd embodiment which actualized this invention, (a) is sectional drawing similar to Fig.5 (a), (b) FIG. 2 is an enlarged view of a main part of (a). It is a plane sectional view of the electrode part structure of the conventional induction charging type electrostatic spraying device.

  1 to 6 show an induction charging type electrostatic spraying device 10 and an electrode portion structure 1 thereof according to a first embodiment embodying the present invention. As shown in FIGS. 1 to 4, the electrostatic spraying device 10 of this example includes a pair of left and right nozzle portions 11 that eject liquid supplied from the base end side as droplets D from the tip end portion, and both It is a two-headed mouth type provided with the electrode part structure 1 mounted on the outer side in the left-right direction of the nozzle part 11. In the electrostatic spraying device 10 of this example, two nozzle parts and two electrode part structures 1 are provided, and these are configured in line symmetry with the center line of the axis of both nozzle parts 11 as the axis of symmetry. Therefore, hereinafter, the details of the nozzle part 11 and the electrode part structure 1 will be described only on the right side. In each drawing, an arrow F indicates the tip side of the nozzle portion 11.

  The electrode part structure 1 of the present invention is formed in an axial shape extending from the proximal end side of the nozzle part 11 to the distal end part side with an interval to the side of the nozzle part 11, and the proximal end of the nozzle part 11 An electrode support shaft 2 having a base end portion supported on the side of the electrode, a shaft cover 3 provided on the base end portion side of the electrode support shaft 2, and a tip portion of the electrode support shaft 2; A substantially annular electrode 5 formed so that the inner periphery is close to the outer periphery of the diffusion range of D, and the leakage prevention unit 4 disposed between the shaft cover 3 and the electrode 5, and the liquid and The liquid droplet D is configured to be inductively charged by applying a high voltage between the electrodes 5.

  The nozzle unit 11 is configured to be connected to the injection tube 13 through the joint 12, and is configured to eject the liquid to be sprayed supplied through the injection tube 13 as droplets D. Yes. The nozzle portion 11 may be made of either a nonconductive material or a conductive material. The nozzle portion 11 of this example is made of resin in order to reduce the weight. The nozzle portion 11 is provided with a holding portion 6 that detachably supports the proximal end portion of the electrode support shaft 2 with respect to the proximal end portion side of the nozzle portion 11.

  A part of the jet tube 13 is made of a conductive material and is grounded, so that the liquid is grounded. The aspect of grounding the liquid is not limited to this, and other conductive parts (the nozzle portion 11, the liquid storage tank formed of a conductive material, etc.) in contact with the liquid or in the liquid The aspect by earth | grounding the immersed electrode etc. is illustrated.

  In this example, the electrode 5 is formed in an annular shape, and is disposed so as to be close to the outside of the diffusion range of the droplet D ejected from the nozzle portion 11, and via a high-voltage cable 7 as a coated conductor. Thus, a high voltage (about +6.3 kV in this example) supplied from a power supply unit (not shown) is applied. The high voltage cable 7 is covered with a non-conductive material. The shape of the electrode 5 is not particularly limited as long as it is substantially annular, and an aspect formed in a C shape with one portion broken or a plurality of members connected to each other by a conductor are arranged in a substantially annular shape. The aspect which consists of is illustrated.

  The electrode support shaft 2 is formed in a cylindrical shape, and a high voltage cable 7 is wired in the cylinder.

  As shown in FIGS. 4 to 6, the holding unit 6 includes a first holding piece 21 and a second holding piece 22. Both the holding pieces 21 and 22 are provided with grooves. At the joint portion between the groove of both holding pieces 21, 22 and the outer periphery of the base end portion of the electrode support shaft 2, the electrode support shaft 2 is prevented from coming off and rotated around the both holding pieces 21, 22. As the stopping means 25, concaves and convexes that are relatively fitted are formed. The first holding piece 21 is formed integrally with the main body of the nozzle portion 11. The second holding piece 22 is configured to be detachable from the first holding piece 21 by snap fitting. The snap fit of the holding portion 6 is realized by locking the hook 22 a provided on the second holding piece 22 to the locked portion 21 a provided on the first holding piece 21. The hook 22a has a shape protruding in a tapered shape toward the locked portion 21a in both the mounting direction and the detaching direction so that the hook 22a can be engaged and disengaged with respect to the locked portion 21a in a nondestructive manner. With such a configuration, both holding pieces 21 and 22 can be engaged with each other so as to hold the outer periphery of the base end portion of the electrode support shaft 2. The holding portion 6 holds the electrode support shaft 2 in a state where the first holding piece 21 and the second holding piece 22 are attached to and detached from the distal end portion of the electrode support shaft 2. When a bending moment exceeding a predetermined value is applied, the engagement between the holding pieces 21 and 22 is released. As shown in FIG. 2, the second holding piece 22 is provided with a hole 27 for connecting a string-like body 26 for preventing scattering, and the electrostatic spraying device is interposed through the string-like body 26. It is configured to be able to be tethered to 10 other parts so as to be relatively movable. In addition, the predetermined value about the said external force can be suitably set according to conditions, such as intensity | strength and rigidity, etc. of the electrode support shaft 2, the holding | maintenance part 6, and the main body of the nozzle part 11.

  The shaft cover 3 has a peripheral wall portion surrounding the electrode support shaft 2 connected to the main body of the nozzle portion 11, and a bottom wall portion closing the proximal end side of the peripheral wall portion connected to the first holding piece. It is formed in a cup shape and prevents an external force from being applied directly to the electrode support shaft 2. A plurality of air holes 3a are provided in the peripheral wall portion at intervals in the circumferential direction.

  The leakage prevention unit 4 is a creeping surface connecting the electrode 5 as a high potential side portion and the nozzle portion 11 and the jet tube 13 as a leakage protection side portion which is a portion to be protected against leakage from the electrode 5. It is provided in the middle. The leakage prevention unit 4 of the present example includes an annular recess 37 extending so as to divide the creeping surface, and a cylindrical heater 38 attached to the outer periphery of the electrode support shaft 2 inside the annular recess 37. These components are made of at least a surface made of an electrically insulating material. The depth of the annular recess 37 extends in the length direction of the electrode support shaft 2, and the opening thereof faces in the length direction of the electrode support shaft 2. The heater 38 is supplied with electric power through a dedicated power cable 38a to heat the internal space of the annular recess 37, thereby increasing the temperature of the surface forming the space and causing condensation on the surface. To prevent the occurrence of electric leakage due to the condensation.

According to the electrode part structure 1 of the present example configured as described above, even if the surface of the electrode support shaft 2 is covered with a continuous film of liquid that continues from the electrode 5 after spraying starts, Since the electrode support shaft 2 is formed in the shape of a shaft and exists only on the side of the nozzle portion 11, it has a ground potential higher than that of the conventional electrode portion structure in which the high potential portion exists on the entire outer periphery of the nozzle portion. It is difficult to touch and the occurrence of leakage can be greatly reduced. In addition, since the shaft cover 3 and the leakage prevention unit 4 are provided in this example, the occurrence of leakage can be further reduced.
In addition, the holding portion 6 that supports the electrode support shaft 2 is configured such that when the distal end portion of the electrode support shaft 2 receives a predetermined external force, the support of the base end portion of the electrode support shaft 2 is released. For this reason, when an impact is applied to the electrode 5 and the electrode support shaft 2, the electrode 5, the electrode support shaft 2, the holding portion 6, the nozzle portion 11 and the like can be prevented from being damaged.

  The holding portion 6 includes a pair of holding pieces 21 and 22, which can be engaged with each other so as to hold the outer periphery of the electrode support shaft 2, and When the predetermined external force is applied to the tip end portion of the electrode support shaft 2 while being held, the mutual engagement is released. According to this configuration, the structure in which the support of the base end portion of the electrode support shaft 2 is released when the predetermined external force is applied to the distal end portion of the electrode support shaft 2 can be realized with a simple structure and at low cost. it can.

  Moreover, since the 2nd holding piece 22 is comprised so that a relative free-movable connection is possible to the other site | part of the electrostatic spraying apparatus 10 via the string-like body for scattering prevention, It is possible to prevent the second holding piece 22 from being scattered when the engagement is released.

The induction charging type electrostatic spraying device 10 of the present invention is a two-headed mouth type having two nozzle portions 11 and two electrode portion structures 1 configured as described above. In the head-and-mouth type, if both nozzle portions 11 are moved in a direction orthogonal to the direction in which both nozzle portions 11 are arranged, it is possible to efficiently spray over a wide range with a small amount of movement. For this reason, during spraying, the two nozzle portions 11 are most likely to be moved in this moving direction, so the external force applied to the electrode support shaft 2 is most likely to be from this direction.
Therefore, in the present configuration, the direction of the external force (attachment / detachment direction A) in which the support of the base end portion of the electrode support shaft 2 is released is made coincident with the moving direction with the highest possibility. The effects of the above can be exhibited stably and reliably.

  In addition, in the induction charging type electrostatic spraying apparatus 10 of the present invention, since the electrode part structure 1 is respectively provided on the outer side in the left-right direction of the both nozzle parts 11, each electrode part structure 1 is moved from the inner side in the left-right direction. It is possible to prevent external force from being applied.

  Next, FIG. 7 shows a second embodiment that embodies the present invention. This induction charging type electrostatic spraying apparatus 10 and its electrode part structure 1 are mainly different from the first embodiment in the following points. Accordingly, portions common to the embodiment are given the same reference numerals, and redundant description is omitted.

  In this example, a pair of inclined surfaces 28 extending in the axial direction of the electrode support shaft 2 are provided on both sides of the electrode support shaft 2 in the A direction, and a pair of the first holding piece 21 and the second holding piece 22 A pair of inclined surfaces 29 fitted to the inclined surfaces are provided. Also with the electrode support shaft 2 and the holding portion 6 of this modified example, the same effects as the electrode support shaft 2 and the holding portion 6 shown in FIGS. Moreover, according to this modified example, as shown in FIG. 7B, when a torsional moment exceeding a predetermined value is applied to the electrode support shaft 2 while holding the electrode support shaft 2, the inclined surface The force in the torsional direction T is divided in the attaching / detaching direction A by 28 and 29, whereby the engagement between the holding pieces 21 and 22 is released.

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 holding part 6 is composed of three or more holding pieces. For example, it is exemplified that it is constituted by a plurality of holding pieces divided into three or more in the circumferential direction of the electrode support shaft 2.
(2) In the induction charging type electrostatic spraying apparatus 10, the electrode part structure 1 is provided on the inner side in the left-right direction of both the nozzle parts 11.

DESCRIPTION OF SYMBOLS 1 Electrode part structure 2 Electrode support shaft 3 Shaft cover 3a Ventilation hole 4 Earth leakage prevention part 5 Electrode 6 Holding part 7 High voltage cable 10 Electrostatic spraying device 11 Nozzle part 12 Joint 13 Jet pipe 21 Holding piece 21a Locked part 22 Holding piece 22a Hook 25 Retaining and preventing means 26 String body 27 Hole 28 Inclined surface 29 Inclined surface 37 Annular recess 38 Heater 38a Power cable D Droplet F Nozzle part A Attaching / detaching direction T Twisting direction

Claims (4)

It is equipped with a nozzle part that ejects liquid supplied from the base end side as droplets from the tip part,
A shaft-like electrode support shaft in which the base end portion is supported on the base end portion side of the nozzle portion, and the tip end portion extends to the tip end side of the nozzle portion at a lateral interval from the nozzle portion. And an approximately annular electrode disposed at the tip of the electrode support shaft and formed so that the inner periphery is close to the outer periphery of the diffusion range of the droplet, and a high gap is provided between the liquid and the electrode. In the electrode part structure of the induction charging type electrostatic spraying device which is configured to induce charging of the droplet by applying a voltage,
The electrode support shaft is supported so that the base end portion thereof is detachably attached to the base end side of the nozzle portion via a holding portion,
The holding part is an electrode part of an induction charging type electrostatic spraying device configured such that when the distal end of the electrode support shaft receives a predetermined external force, the support of the base end of the electrode support shaft is released by the force. Construction. The holding portion includes a plurality of holding pieces,
The plurality of holding pieces can be engaged with each other so as to hold the outer periphery of the electrode support shaft and receive the predetermined external force at the tip of the electrode support shaft in the held state. The electrode part structure of the induction charging type electrostatic spraying apparatus according to claim 1, wherein the mutual engagement is released by the force of each other.   The inductively charged electrostatic spray according to claim 2, wherein the holding piece is configured to be capable of being relatively freely movably connected to another part of the electrostatic spraying device via a string-like body for preventing scattering. Device electrode structure. Either of the left-right paired nozzle part which ejects the liquid supplied from a base end part as a droplet from a front-end | tip part, and the side in the left-right direction of both these nozzle parts are each equipped with either. Comprising the electrode part structure according to one item,
When the holding portion receives an external force having a predetermined strength from a direction orthogonal to the arrangement direction of the two nozzle portions as the predetermined external force, the holding portion supports the base end portion of the electrode support shaft by the force. An induction charging electrostatic spraying device configured to be released.

Images