JP6589280B2 - Electrostatic spraying equipment - Google Patents

Description

  The present invention relates to an electrostatic spraying device.

  In Patent Document 1, the outer diameter of the tip of the capillary serving as the nozzle is 80 μm, and the sample solution is applied to the sample substrate placed on the sample holder by applying a high voltage between the capillary and the sample holder. An electrostatic spraying device for spraying is disclosed.

  Moreover, in patent document 1, the cap part which can be attached in order to seal a capillary front-end | tip in the cover part which covers a capillary side surface and the capillary front end of a cover part is comprised, and clogging by drying of a capillary front-end | tip at the time of spray stop is carried out. Preventing is disclosed.

JP 2006-116491 A

By the way, if the nozzle inner diameter is small, clogging or the like is likely to occur, and furthermore, even if clogging occurs, it is difficult to clean, so there is a problem that it is necessary to replace with a new nozzle.
Therefore, when the nozzle opening diameter was increased so that clogging hardly occurred, a new problem that the state of atomization of the liquid was not stable occurred.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electrostatic spraying device that can perform stable atomization even when the opening diameter of the nozzle is increased.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) The electrostatic spraying device of the present invention applies a voltage between the liquid spraying unit, the proximity electrode disposed in the vicinity of the tip of the liquid spraying unit, and the liquid spraying unit and the proximity electrode, A voltage is applied between the first and second voltage applying means for generating an electrostatic force for separating the liquid from the tip of the liquid spraying part in a charged state, and the liquid spraying part and the object to be coated. A second voltage applying means for generating an electrostatic force that draws the liquid atomized by an electric explosion to the object to be coated, and the liquid spraying section has a liquid nozzle having an opening serving as an outlet of the liquid; A mandrel is movably disposed within the liquid nozzle.
(2) The electrostatic spraying device of the present invention applies a voltage between the liquid spraying unit and the liquid spraying unit and the object to be coated, and causes the liquid to be detached from the tip of the liquid spraying unit in a charged state. And a third voltage applying means for generating an electrostatic force for attracting the liquid atomized by electrostatic explosion to the object to be coated, wherein the liquid spraying portion has an opening serving as an outlet of the liquid. And a mandrel that is movably disposed in the liquid nozzle.
(3) The electrostatic spraying device of the present invention applies a voltage between the liquid spraying unit, the proximity electrode disposed in the vicinity of the tip of the liquid spraying unit, and the liquid spraying unit and the proximity electrode, And a fourth voltage applying means for generating an electrostatic force for detaching the liquid from the tip of the liquid spraying part in a charged state, wherein the liquid spraying part has an opening serving as an outlet of the liquid And a mandrel that is movably disposed in the liquid nozzle.
(4) In the configuration of any one of (1) to (3) above, the opening of the liquid nozzle in the front-rear direction along the central axis of the mandrel when the tip of the mandrel is sprayed with the liquid With respect to the tip surface of the opening, the opening is located at a position within 10 times the opening diameter of the opening.
(5) In any one of the constitutions (1) to (4), the mandrel is movable in the front-rear direction along the central axis of the mandrel in order to adjust the position of the tip of the mandrel. .
(6) In the configuration of (5), the liquid nozzle has a tapered inner diameter portion having a taper angle α that decreases in an inner diameter in a tapered manner toward the opening, and the mandrel includes the liquid A taper angle portion having a taper angle β that becomes smaller in outer diameter toward a tip having a diameter smaller than the opening diameter of the opening portion of the nozzle is β, and the taper angle α is larger than the taper angle β.
(7) In the configuration of (6), the tapered portion of the mandrel has a portion having a diameter larger than the opening diameter of the opening of the liquid nozzle, and the mandrel does not spray the liquid. The opening of the liquid nozzle can be closed.
(8) In any one of the constitutions (1) to (7), the mandrel can be removed from the liquid spray portion.
(9) In any one of the constitutions (1) to (8), the mandrel is made of a conductive material, and the mandrel is an electrode of the liquid spray unit for applying a voltage.

  ADVANTAGE OF THE INVENTION According to this invention, even if the opening diameter of a nozzle is enlarged, the electrostatic spray apparatus which can perform stable atomization can be provided.

It is sectional drawing which shows the whole structure of the electrostatic spraying apparatus of 1st Embodiment which concerns on this invention. It is the perspective view which showed the liquid spraying part and proximity electrode of 1st Embodiment. It is a figure for demonstrating the state sprayed on to-be-coated object using the electrostatic spraying apparatus of 1st Embodiment. It is sectional drawing which shows the whole structure of the electrostatic spraying apparatus of 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the whole structure of the electrostatic spraying apparatus of 3rd Embodiment which concerns on this invention. It is sectional drawing which shows the principal part of the electrostatic spraying apparatus of 4th Embodiment which concerns on this invention, (a) is a figure which shows the case where the front end surface of a mandrel is located back, (b) is the tip of a mandrel. It is the figure which showed the case where a surface is located ahead of (a).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.
Unless otherwise specified, expressions such as “front (end)” and “front (direction)” indicate the spray direction side of the liquid in each member, etc., and “rear (end)” or “rear (direction)”. The expression "" represents the opposite side of the liquid spraying direction in each member or the like.

(First embodiment)
FIG. 1 is a cross-sectional view showing the overall configuration of the electrostatic spraying device 10 of the first embodiment.
As shown in FIG. 1, the electrostatic spraying device 10 includes a liquid spray unit 20, a proximity electrode 30 disposed near the tip of the liquid spray unit 20, and a voltage between the liquid spray unit 20 and the proximity electrode 30. And a first voltage applying means 51 for applying.
Moreover, the 2nd voltage application means 52 which applies a voltage between the liquid spraying part 20 and the to-be-coated article 40 is provided.

(Liquid spray part)
The liquid spray unit 20 has a main body 21 made of an insulating material in which a liquid channel 21b having a liquid supply port 21a to which a liquid is supplied is formed, and a through hole communicates with the liquid channel 21b of the main body 21. A liquid nozzle 22 provided at the tip of the main body 21 and a mandrel 23 made of a conductive material disposed in the liquid channel 21 b of the main body 21 and in the through hole of the liquid nozzle 22 are provided.
In this embodiment, the inner diameter of the through hole of the liquid nozzle 22 is 0.2 mm, and the mandrel 23 has a diameter that allows a gap that does not hinder the flow of the liquid to be formed between the inner peripheral surface of the liquid nozzle 22. It is said.

In this embodiment, since the liquid nozzle 22 has a substantially uniform inner diameter from the rear end side to the front end side, the opening diameter of the opening 22b of the liquid nozzle 22 from which the liquid comes out is also 0.2 mm. .
However, the opening diameter of the opening 22b of the liquid nozzle 22 may be about 1 mm, and the reason why the atomization stability can be maintained will be described in detail later. However, the opening diameter of the opening 22b of the liquid nozzle 22 is In consideration of clogging and being able to be cleaned even when clogging occurs and the stability of atomization, it is preferably 0.1 mm or more, more preferably 0.2 mm or more. Yes, more preferably greater than 0.2 mm, while 1.0 mm or less is preferred, more preferably 0.8 mm or less, and even more preferably 0.5 mm or less.
Further, if the opening diameter is 0.1 mm or more, there is an advantage that the liquid nozzle 22 can be manufactured by machining.

The main body portion 21 is provided with a hole portion 21c communicating with the liquid channel 21b in order to take out the mandrel 23 to the rear end side, and a gap between the mandrel 23 is sealed in the hole portion 21c. A seal member 24 is provided to prevent liquid from leaking.
In this embodiment, an O-ring is used as the seal member 24. However, the O-ring is not limited to the O-ring, and any member that can be sealed may be used.

  Further, at the rear end of the mandrel 23 positioned on the rear end side of the main body portion 21 through the hole portion 21c, a knob portion 23a made of an insulating material is provided, and provided so as to penetrate substantially the center of the knob portion 23a. An electrical wiring connection portion 23b made of the conductive material thus provided is provided.

The electrical wiring connection portion 23b is connected to the electrical wiring from the second voltage application means 52, and the electrical wiring connection portion 23b is brought into contact with the mandrel 23 so that the mandrel 23 and the electrical wiring connection portion 23b Are electrically connected.
In the present embodiment, the case where the mandrel 23 is used as the electrode of the liquid spray unit 20 is shown. However, the liquid nozzle 22 is made of a conductive material, and the electric wiring from the second voltage applying unit 52 is connected to the liquid nozzle 22. The liquid nozzle 22 may be used as an electrode of the liquid spraying unit 20 so as to be connected.

  A female screw structure 21e for screwing and connecting the knob 23a is provided on the inner peripheral surface of the rear end opening 21d of the main body 21, while a male screw is provided on the outer peripheral surface of the tip of the knob 23a. A structure 23c is provided.

Therefore, the mandrel 23 is detachably attached to the main body portion 21 by screwing the male screw structure 23c on the outer peripheral surface of the tip of the knob portion 23a into the female screw structure 21e of the rear end opening portion 21d of the main body portion 21.
Further, the mandrel 23 can be moved in the front-rear direction by adjusting the screwing amount of the knob 23a, and the position of the distal end surface 23d of the mandrel 23 can be adjusted in the front-rear direction.

On the other hand, a proximity electrode holder 25 for attaching the proximity electrode 30 is provided on the outer peripheral surface of the liquid nozzle 22.
FIG. 2 is a perspective view showing only the liquid spray unit 20 and the proximity electrode 30.
As shown in FIG. 2, the proximity electrode holder 25 has an annular structure made of an insulating material provided on the outer periphery of the liquid nozzle 22, and a proximity electrode mounting portion for attaching the proximity electrode 30 to the tip of the annular structure. 25a is provided.

(Proximity electrode)
As shown in FIG. 1, the proximity electrode 30 is a member made of a ring-shaped conductive material having a diameter larger than the outer diameter of the liquid nozzle 22, and is connected to the electrical wiring from the first voltage application unit 51. The
In the present embodiment, the case where the proximity electrode 30 is located in front of the liquid nozzle 22 is shown. However, if the proximity electrode 30 is in the vicinity of the liquid nozzle 22, it is slightly behind the tip of the liquid nozzle 22. There is no problem even if it is located.
In the present embodiment, the proximity electrode 30 has a circular ring shape, but may be a polygonal ring shape or an arc shape.

Next, with reference to FIG. 3, a state where the liquid is sprayed on the article 40 using the electrostatic spraying apparatus 10 according to the first embodiment having the above-described configuration will be described.
The liquid supplied to the liquid supply port 21 a of the main body 21 is supplied to the tip side of the liquid nozzle 22, and is moved forward by the electrostatic force accompanying the voltage applied between the proximity electrode 30 and the mandrel 23. Pulled forward and atomized.
In addition, the supply of the liquid only needs to be sequentially supplied with the amount of liquid lost from the liquid spraying part 20 by being consumed by spraying, and the opening 22b of the liquid nozzle 22 (more precisely, the opening 22b and There is no need to pump and supply the liquid at such a pressure that the liquid is ejected from the gap between the mandrel 23. In a state where the liquid is ejected vigorously, it may be impossible to atomize.

  More specifically, static electricity that pulls the liquid forward against the adhesion force due to surface tension or viscosity on the distal end surface 23d of the mandrel 23 (hereinafter also referred to as the tip of the mandrel 23) and the outer peripheral edge 22a of the liquid nozzle 22. When the forces are balanced, as shown in FIG. 3, a tailor cone 50 is formed in which the liquid supplied to the tip side of the liquid nozzle 22 has a conical shape at the tip.

The tailor cone 50 is formed in a conical shape by separating the positive / negative charges in the liquid by the action of an electric field, and deforming the meniscus at the tip of the liquid nozzle 22 charged with an excess charge.
Then, the liquid released from the liquid nozzle 22 is released so that the charged liquid is pulled almost straight from the tip of the tailor cone 50 by electrostatic force, and then spreads upward, downward, left and right obliquely forward by electrostatic explosion. .
The liquid that has been separated to form liquid particles has a drastically increased area in contact with air compared to the state prior to separation, and thus the evaporation of the solvent is promoted, and between the charged electrons as the solvent evaporates. , The electrostatic repulsion (electrostatic explosion) occurs and further breaks up into small liquid particles.

When this splitting occurs, the surface area in contact with air increases compared to before splitting, so that the evaporation of the solvent is promoted, an electrostatic explosion occurs as described above, and a liquid with a small particle size. Split into particles.
The liquid is atomized by repeating such electrostatic explosion.

  When the liquid particles flying forward by inertia force while repeating electrostatic explosion in this way exceed the position of the proximity electrode 30, the second voltage application means 52 causes the liquid spray unit 20 and the article 40 to be interposed. The atomized liquid is attracted to the object to be coated 40 by the electrostatic force generated by the voltage applied to, and adheres to the object to be coated 40.

Here, in the present invention, the mandrel 23 is provided in the liquid nozzle 22.
Assuming that the mandrel 23 is not provided as in the conventional electrostatic spraying device, the liquid can be attached only to the tip outer peripheral edge 22 a of the liquid nozzle 22.

  When the opening diameter of the opening 22b of the liquid nozzle 22 is increased in such a state, the portion to which the liquid can be attached is only the tip outer peripheral edge 22a of the liquid nozzle 22; The liquid easily fluctuates from side to side, and it becomes impossible to form a beautiful tailor cone 50, or the tailor cone 50 itself cannot be maintained. It is presumed that the stability of the charged state) cannot be obtained, and as a result, the liquid cannot be stably atomized.

On the other hand, in the present invention, the mandrel 23 is disposed in the liquid nozzle 22, and the liquid adheres not only to the outer peripheral edge 22 a of the liquid nozzle 22 but also to the distal end surface 23 d of the mandrel 23.
Therefore, even if the opening diameter of the opening 22b of the liquid nozzle 22 is increased, the tip surface 23d of the mandrel 23 to which the liquid can adhere is present at the center of the opening 22b. The opening diameter of the portion 22b is also considered to make it possible to form a stable tailor cone 50 and to stably atomize the liquid.

  If the front end surface 23d of the mandrel 23 protrudes too far forward from the front outer peripheral edge 22a of the liquid nozzle 22 (that is, the front end surface of the opening 22b of the liquid nozzle 22), the electric field is less likely to act on the liquid exiting the liquid nozzle 22. On the other hand, if the distal end surface 23d of the mandrel 23 is excessively retracted backward from the distal end surface of the opening 22b of the liquid nozzle 22, the state is the same as when there is no portion where the liquid can adhere to the central portion of the opening 22b.

  From this, the position of the tip (tip surface 23d) of the mandrel 23 is in the front-rear direction along the central axis of the mandrel 23, with the tip surface of the opening 22b of the liquid nozzle 22 as a reference in the state where the liquid is sprayed. The liquid nozzle 22 is preferably located within 10 times the opening diameter of the opening 22b at the tip, more preferably within 5 times, and even more preferably within 3 times. It is preferable to do.

  For example, in this embodiment, since the inner diameter of the liquid nozzle 22 is 0.2 mm and the inner diameter is substantially uniform in the length direction, the opening diameter of the opening 22b of the liquid nozzle 22 is 0.2 mm, and the electrostatic force Is not taken into consideration, the liquid coming out of the opening 22b of the liquid nozzle 22 comes out in a hemispherical shape having a diameter of about 0.2 mm at the tip of the liquid nozzle 22.

The tip of the mandrel 23 should be close to the liquid so that a conical tailor cone 50 can be formed by applying an electric field (electrostatic force) to the liquid coming out of the tip of the liquid nozzle 22. For this reason, it is preferable to be located within 2 mm forward (in the direction of exit) from the tip surface of the opening 22b of the liquid nozzle 22, while the tip of the mandrel 23 acts on the adhesion of the liquid. It is preferable that the tip is positioned within 2 mm rearward (in the retracting direction) from the tip surface of the opening 22 b of the liquid nozzle 22.

As described above, by providing the mandrel 23, stable atomization of the liquid can be performed even if the opening diameter of the opening 22b of the liquid nozzle 22 is increased.
For this reason, the opening diameter of the opening part 22b of the liquid nozzle 22 can be made into a large opening diameter which can suppress clogging.
Moreover, since the opening diameter of the opening part 22b of the liquid nozzle 22 can be enlarged, the liquid nozzle 22 can be manufactured by machining.
In addition to the above advantages, there are also the following advantages.

For example, the liquid can be atomized by applying a voltage between the liquid spraying unit 20 and the object to be coated 40 by the second voltage applying unit 52 without providing the proximity electrode 30.
However, in this case, the atomization of the liquid stops when the object to be coated 40 is located at a position away from the liquid spraying unit 20 beyond the distance that can generate the electrostatic force capable of atomizing the liquid. become.

  Then, since the coating object 40 approaches the liquid spraying unit 20, the atomization of the liquid is started, and thus the liquid in a state where the atomization at the start of the atomization is not stable is also applied to the coating object 40. It will be.

For example, in the case where the paint is sprayed on the object to be coated 40, application unevenness may occur when the paint to be coated 40 is sprayed with an atomized state that is not stable.
However, according to this embodiment, since the atomization of the liquid is realized by the electrostatic force generated by the voltage applied between the proximity electrode 30 and the liquid spraying part 20, the object 40 is positioned at a position away from the object 40. Thus, a stable atomization state of the paint can be formed in a state where the paint is not applied to the object to be coated 40, and then the coating unevenness is applied by transporting the object 40 to a position where the paint is applied. Can be suppressed.

  In particular, when coating is performed while a large number of objects to be coated 40 are sequentially and continuously conveyed, the object to be coated 40 that has been applied is conveyed away from the liquid spraying unit 20, while a new object to be coated is applied. When the object 40 approaches the liquid spray unit 20 from a distant position, when the atomization of the paint is performed with a voltage applied between the object 40 and the liquid spray unit 20, the object to be coated Since the electric field changes with the movement of 40, the state of the atomization of the paint is difficult to stabilize, but in this embodiment, the atomization of the paint can be performed regardless of the distance between the object to be coated 40 and the liquid spraying part 20. Thus, it is possible to apply a good paint to the object to be coated 40.

Even if the liquid nozzle 22 is clogged, the clogging can be eliminated by moving the mandrel 23.
Furthermore, since the inner diameter of the liquid nozzle 22 is large enough to allow the mandrel 23 to be disposed, the mandrel 23 can be removed and a large amount of cleaning liquid can be circulated in the liquid nozzle 22. The inside can be easily cleaned.

In the above-described embodiment, the case where separate voltage power sources are provided as the first voltage applying unit 51 and the second voltage applying unit 52 has been described. However, two voltage applications can be performed by branching from one voltage power source. Means may be realized.
Further, the liquid nozzle 22 and the main body 21 may be integrally formed, and the shape of the proximity electrode holder 25 is not necessarily limited to the one shown above.
Furthermore, in consideration of safety in handling the object to be coated 40, it is preferable that the object to be coated 40 be grounded.

(Second Embodiment)
FIG. 4 is a cross-sectional view showing the overall configuration of the electrostatic spraying apparatus 10 ′ of the second embodiment.
The difference from the first embodiment is that the configuration related to the proximity electrode 30 in the first embodiment is omitted, and the other points are the same as in the first embodiment.

  That is, the portion of the second voltage applying means 52 of the first embodiment applies a voltage between the liquid spraying part 20 and the object to be coated 40 to separate the liquid from the tip of the liquid spraying part 20 in a charged state. The third difference is that the third voltage applying means 52 ′ generates an electrostatic force for attracting the liquid atomized by the electrostatic explosion to the object 40.

Therefore, since the liquid is separated from the tip of the liquid spray unit 20 in a charged state by the voltage applied between the liquid spray unit 20 and the object to be coated 40, the configuration related to the proximity electrode 30 is unnecessary, and the electrostatic There exists an advantage that the structure as a spraying device itself can be made simple.
In addition, since the second embodiment is also configured to have the mandrel 23, it has the same function and effect as those obtained by using the mandrel 23 described in the first embodiment.

(Third embodiment)
FIG. 5 is a cross-sectional view showing the overall configuration of the electrostatic spraying apparatus 10 ″ of the third embodiment.
The difference from the first embodiment is that a voltage is applied between the liquid spray unit 20 and the object to be coated 40 in the first embodiment, and the liquid atomized by the electrostatic explosion is attracted to the object to be coated 40. The configuration of the second voltage applying means 52 that generates the electrostatic force is omitted, and the other points are the same as in the first embodiment.

That is, the configuration in which the voltage is applied is a fourth voltage that generates an electrostatic force for applying a voltage between the liquid spray unit 20 and the proximity electrode 30 and causing the liquid to be detached from the tip of the liquid spray unit 20 in a charged state. Only the applying means 51 ′ is used.
In this configuration as well, naturally, the liquid is discharged from the tip of the liquid spraying portion 20 in a charged state, and the released liquid (liquid particles) is repeatedly atomized in an atomized state.

In the case of the first and second embodiments, the atomized liquid is attracted to the article 40 by electrostatic force.
On the other hand, in the third embodiment, since the effect is not obtained, when the electrostatic spraying apparatus 10 '' of the third embodiment is used for an application in which a coating material is applied to the coating object 40, the coating material for the coating object 40 is not affected. The point of adhesion efficiency will be inferior.
However, as can be seen from FIG. 5, in the configuration of the third embodiment, since the electrostatic spraying device 10 '' can be configured regardless of the article to be coated 40, a compact electrostatic spraying device that is easy to move and the like is configured. can do.

  In an electrostatic spraying device, not only when there is an object to be coated with liquid, but there are also scenes where the liquid can be atomized and sprayed, for example, chemical spraying, For such a purpose, it is considered that there is a high demand for being portable.

Also, even in applications where paint is applied to the object to be coated, there are also applications where the electrostatic spraying device must be transported to the object already installed and the paint must be applied. is there.
In applications where such an electrostatic spraying device is required to be easily moved, the electrostatic spraying device 10 '' of the third embodiment is particularly suitable.
In addition, since the third embodiment is also configured to have the mandrel 23, the third embodiment has the same effect as that obtained by using the mandrel 23 described in the first embodiment.

(Fourth embodiment)
FIG. 6 is a diagram showing the main part of the fourth embodiment, and is an enlarged view in which the tip end side of the liquid spraying part 20 is enlarged.
6 (a) and 6 (b) show only the liquid nozzle 22 and the mandrel 23, and FIG. 6 (a) shows a case where the tip surface 23d of the mandrel 23 is located rearward. FIG. 6B shows a case where the distal end surface 23d of the mandrel 23 is positioned more forward than in the state of FIG.

The fourth embodiment is a modification of the liquid nozzle 22 and the mandrel 23, and can be applied to any of the first, second, and third embodiments described above.
As shown in FIG. 6 (a), in the fourth embodiment, the liquid nozzle 22 has a tapered inner diameter portion where the taper angle becomes α tapered toward the opening 22b (see range A). The mandrel 23 has a tapered portion (see range B) having a taper angle β of which the outer diameter decreases toward the tip (tip surface 23d).

The taper angle α of the tapered inner diameter portion of the liquid nozzle 22 is set larger than the taper angle β of the tapered portion of the mandrel 23.
As in the first, second, and third embodiments, the diameter of the tip (tip surface 23 d) of the mandrel 23 is smaller than the diameter of the opening 22 b of the liquid nozzle 22. The tapered portion is formed so as to gradually increase in diameter toward the rear end side and to have a portion having a diameter larger than the opening diameter of the opening 22 b of the liquid nozzle 22.

  As described above, by forming the tip side of the liquid nozzle 22 and the mandrel 23, as can be seen by comparing FIGS. 6 (a) and 6 (b), the mandrel 23 is moved in the front-rear direction so that the liquid nozzle 22 The width of the gap formed by the mandrel 23 can be adjusted, and the amount of liquid coming out from the opening 22b of the liquid nozzle 22 can be adjusted.

Further, by moving the mandrel 23 further forward than in the state shown in FIG. 6B, the mandrel 23 comes into contact with the inner peripheral surface of the liquid nozzle 22 and closes the opening 22 b of the liquid nozzle 22. Is possible.
Therefore, it is possible to prevent the liquid in the liquid nozzle 22 from drying by closing the opening 22b of the liquid nozzle 22 with the mandrel 23 in a state where the liquid is not sprayed, and the liquid nozzle 22 is clogged. This can be suppressed.

As mentioned above, although this invention was demonstrated based on specific embodiment, this invention is not limited to the said embodiment, You may implement a deformation | transformation and improvement suitably.
For example, in the above-described embodiment, the case where the electrical wiring from the voltage application unit is connected to the object to be coated 40 is shown, but the electrical wiring from the voltage application unit is connected to a member such as a holder in which the object to be coated 40 is arranged. In addition, a voltage is applied between the object to be coated 40 and the liquid spraying unit 20 as an aspect in which the object to be coated 40 is electrically connected to the voltage applying means via a holder or the like. Also good.

  Moreover, although the case where the proximity electrode holder 25 is provided on the outer peripheral surface of the liquid nozzle 22 has been described in the above embodiment, the proximity electrode holder 25 arranges the proximity electrode 30 in the vicinity of the tip of the liquid spray unit 20. As long as the function can be achieved, the fixing part itself to which the proximity electrode holder 25 is attached is not particularly limited, and needless to say, it may be fixed to the main body 21.

  Further, as shown in FIG. 1 and FIG. 6, the case where the tip surface 23d of the mandrel 23 is a flat plane has been shown, but the tip of the mandrel 23 does not necessarily have to be a flat plane, and a stable tailor cone For example, the tip of the mandrel 23 may be a curved surface that protrudes toward the front side, such as an R shape.

  Thus, the present invention is not limited to a specific embodiment, and modifications and improvements as appropriate are also included in the technical scope of the present invention. Is clear from the description of the scope of claims.

10, 10 ′, 10 ″ electrostatic spraying device 20 liquid spraying part 21 body part 21a liquid supply port 21b liquid channel 21c hole part 21d rear end opening part 22 liquid nozzle 22a front end outer peripheral edge 22b opening part 23 mandrel 23a knob part 23b Electric wiring connection portion 23c Male screw structure 23d Tip surface 24 Seal member 25 Proximity electrode holder 25a Proximity electrode mounting portion 30 Proximity electrode 40 Object 51 First voltage application means 51 ′ Fourth voltage application means 52 Second voltage application means 52 'Third voltage applying means

Claims (8)

A liquid spraying section;
A proximity electrode disposed in the vicinity of the tip of the liquid spraying part;
A first voltage applying unit that applies a voltage between the liquid spray unit and the proximity electrode, and generates an electrostatic force for separating the liquid from the tip of the liquid spray unit in a charged state;
A second voltage applying means for generating an electrostatic force that applies a voltage between the liquid spraying part and the object to be coated, and that separates and atomizes the liquid atomized by electrostatic explosion to the object to be coated; ,
The liquid spraying section,
A liquid nozzle having an opening serving as an outlet of the liquid;
A mandrel that is movably disposed within the liquid nozzle, and forming a tailor cone that stabilizes spraying on the distal end surface of the mandrel and the outer peripheral edge of the liquid nozzle ;
The mandrel is made of a conductive material, wherein the mandrel is an electrostatic spray device characterized that you have been with the liquid spray of the electrode for applying a voltage. A liquid spraying section;
A voltage is applied between the liquid spraying part and the object to be coated, and the liquid is separated from the tip of the liquid spraying part in a charged state and separated and atomized by electrostatic explosion to the object to be coated. A third voltage applying means for generating an electrostatic force for drawing,
The liquid spraying section,
A liquid nozzle having an opening serving as an outlet of the liquid;
A mandrel that is movably disposed within the liquid nozzle, and forming a tailor cone that stabilizes spraying on the distal end surface of the mandrel and the outer peripheral edge of the liquid nozzle ;
The mandrel is made of a conductive material, wherein the mandrel is an electrostatic spraying device according to the Rukoto feature is a liquid spray unit of electrodes for applying a voltage. A liquid spraying section;
A proximity electrode disposed in the vicinity of the tip of the liquid spraying part;
A fourth voltage applying unit that applies a voltage between the liquid spraying unit and the proximity electrode, and generates an electrostatic force for separating the liquid from the tip of the liquid spraying unit in a charged state,
The liquid spraying section,
A liquid nozzle having an opening serving as an outlet of the liquid;
A mandrel that is movably disposed within the liquid nozzle, and forming a tailor cone that stabilizes spraying on the distal end surface of the mandrel and the outer peripheral edge of the liquid nozzle ;
The mandrel is made of a conductive material, wherein the mandrel is an electrostatic spraying device according to the Rukoto feature is a liquid spray unit of electrodes for applying a voltage.   In a state where the tip of the mandrel is sprayed with the liquid, the opening diameter of the opening within 10 times the opening diameter of the opening of the liquid nozzle in the front-rear direction along the central axis of the mandrel. The electrostatic spraying device according to any one of claims 1 to 3, wherein the electrostatic spraying device is located at a position.   The said mandrel is movable to the front-back direction along the center axis | shaft of the said mandrel in order to adjust the position of the front-end | tip of the said mandrel, The any one of Claims 1-4 characterized by the above-mentioned. Electrostatic spraying device. The liquid nozzle has a tapered inner diameter portion having a taper angle α that decreases in an inner diameter in a tapered manner toward the opening side,
The mandrel has a taper-shaped portion having a taper angle β of which the outer diameter decreases toward the tip having a diameter smaller than the opening diameter of the opening of the liquid nozzle;
The electrostatic spraying device according to claim 5, wherein the taper angle α is larger than the taper angle β. The tapered portion of the mandrel has a portion with a diameter larger than the opening diameter of the opening of the liquid nozzle;
The electrostatic spraying device according to claim 6, wherein the mandrel can close the opening of the liquid nozzle in a state where the liquid is not sprayed. The electrostatic spray device according to claim 1, wherein the mandrel can be removed from the liquid spray unit.

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