JP2017200672A - Electrostatic sprayer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic sprayer capable of stably spraying a liquid such as a coating material onto a coated article.SOLUTION: An electrostatic sprayer 10, which separates a liquid from a nozzle 20 in a charged state with an electrostatic force generated by application of a voltage and sprays the liquid onto a coated article 30, includes a nozzle head 21 provided with a plurality of nozzles 20 formed from a conductive material or a semi-conductive material, and voltage application means 40 which applies a voltage between different electrode portions (coated article 30) being electrodes different from the nozzle 20 to generate an electrostatic force, where the nozzle 20 is provided so that a distance between axial lines L is separated as is apart from the nozzle head 21, between the nozzles 20 to which at least the axial line L of the nozzle 20 is adjacent.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electrostatic spraying device.

Patent Document 1 discloses a spray nozzle device in which a plurality of nozzles arranged in an annular shape are provided in multiple layers in the radial direction and spray electrostatically charged droplets to collect particulate matter in an air flow (Electrostatic spraying device) is disclosed.
And in order to implement | achieve a uniform spray distribution pattern, the nozzle located in the center side is made to protrude.

Special table 2008-516766 gazette

  By the way, even in the configuration of Patent Document 1, for example, the spray may not be stable due to variations in the particle diameter of the droplets to be sprayed, and as in Patent Document 1, dust collection is performed to collect particulate matter in the airflow. In the case of spraying the liquid used in the device, it is only necessary to spray droplets with sufficiently small particle diameters, so this is not a problem, but it is a spray that applies liquid such as paint to the object to be coated. It is desirable that more stable spraying is possible in order to suppress uneven coating of liquid.

  This invention is made | formed in view of such a situation, and it aims at providing the electrostatic spraying apparatus which can spray liquids, such as a coating material, stably to a to-be-coated article.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) The electrostatic spraying apparatus of the present invention is an electrostatic spraying apparatus that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by the application of a voltage. Or a voltage applying means for generating the electrostatic force by applying a voltage between a nozzle head provided with a plurality of the nozzles of a semiconductive material and a different polarity part having a different polarity with respect to the nozzle. The nozzles are provided such that the distance between the axes increases as the axis of the nozzles moves away from the nozzle head between at least adjacent nozzles.

(2) In the configuration of (1), the nozzles are provided such that the distance between the axes increases as the axes of all the nozzles move away from the nozzle head.

(3) The electrostatic spraying apparatus of the present invention is an electrostatic spraying apparatus that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by the application of voltage. Or a voltage applying means for generating the electrostatic force by applying a voltage between a nozzle head made of an insulating material provided with a plurality of the nozzles of a semiconductive material and a different polarity part having a different polarity with respect to the nozzle; The nozzle is provided so as to protrude from the nozzle head, and is provided corresponding to each of the plurality of nozzles in the vicinity of the base portion on the nozzle head side of the nozzle protruding from the nozzle head, A plurality of electrode portions having the same potential as the nozzle are provided.

(4) The electrostatic spraying apparatus of the present invention is an electrostatic spraying apparatus that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by applying a voltage, Or a voltage applying means for generating the electrostatic force by applying a voltage between a nozzle head made of an insulating material provided with a plurality of the nozzles of a semiconductive material and a different polarity part having a different polarity with respect to the nozzle; The nozzle is provided so as to protrude from the nozzle head, and is provided in the vicinity of the base portion on the nozzle head side of the nozzle protruding from the nozzle head so as to correspond to all the nozzles. One electrode portion having the same potential as the nozzle is provided.

(5) The electrostatic spraying apparatus of the present invention is an electrostatic spraying apparatus that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by application of voltage, A voltage applying means for generating the electrostatic force by applying a voltage between a nozzle head of an insulating material provided with a plurality of the nozzles and a different polarity part having a different polarity with respect to the nozzle,
The nozzle is provided so as to protrude from the nozzle head, and the root portion of the nozzle protruding from the nozzle head on the nozzle head side has an outer shape larger than the tip portion of the nozzle.

(6) In the configuration of (5), the root portion of the nozzle has an outer shape larger than the tip portion of the nozzle so that a distance from the root portion of the adjacent nozzle is 5 mm or less. Yes.

(7) In any one of the configurations (1) to (6), the nozzles are arranged side by side along the width direction of the nozzle head.

  ADVANTAGE OF THE INVENTION According to this invention, the electrostatic spraying apparatus which can spray liquids, such as a coating material, stably to a to-be-coated article can be provided.

It is a perspective view of the electrostatic spraying apparatus of 1st Embodiment which concerns on this invention. It is the top view which looked at the electrostatic spraying apparatus of 1st Embodiment which concerns on this invention from the upper side. It is the sectional view on the AA line of FIG. It is a top view for demonstrating the place which sprays a liquid with the electrostatic spraying apparatus of 1st Embodiment which concerns on this invention. It is a perspective view of the electrostatic spraying apparatus of 2nd Embodiment which concerns on this invention. It is a top view for demonstrating the electrostatic spraying apparatus of 3rd Embodiment which concerns on this invention. It is a perspective view for demonstrating the electrostatic spraying apparatus of 4th Embodiment which concerns on this invention.

  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 perspective view of an electrostatic spraying device 10 according to a first embodiment of the present invention, FIG. 2 is a top view of the electrostatic spraying device 10 as viewed from above, and FIG. 3 is an AA view of FIG. It is line sectional drawing.
In FIG. 2, the voltage application means 40 is not shown.

As shown in FIG. 3, the electrostatic spraying device 10 includes a nozzle head 21 provided with a plurality of nozzles 20 of a conductive material or a semiconductive material (a material having a surface resistance of 10 ¹⁰ Ω or less), and a nozzle 20 On the other hand, a voltage applying means 40 (power supply voltage) for generating an electrostatic force by applying a voltage between the different polarity part (the object to be coated 30) having a different polarity is provided.

  In the present embodiment, by connecting one electrical wiring 41 from the voltage applying means 40 directly to the object 30, the different polarity part that makes the object 30 itself different from the nozzle 20. However, for example, one electrical wiring 41 from the voltage application means 40 is connected to a placement portion on which the article 30 is placed, and the placement portion is set as a different polarity portion, and the different polarity portion. The object 30 may be made to have the same potential as that of the different polarity part when the object 30 is in contact therewith.

  Moreover, in this embodiment, the electrostatic spraying apparatus 10 is provided with the earthing | grounding means 50 which earth | grounds the to-be-coated object 30, and although the earthing | grounding means 50 is not an essential requirement, an operator can touch the to-be-coated object 30. Therefore, it is preferably provided from the viewpoint of safety.

The nozzle head 21 includes a liquid supply port 21a to which a liquid to be sprayed is supplied, and a liquid branching portion 21c that communicates with the liquid supply port 21a and has a plurality of liquid outflow holes 21b provided corresponding to the nozzles 20. The nozzle 20 is inserted and fixed in the liquid outflow hole 21b.
A liquid supply pipe from a liquid supply unit (not shown) is connected to the liquid supply port 21a of the nozzle head 21.

  In the present embodiment, as can be seen from FIG. 1, the nozzle head 21 has a rectangular shape when viewed from the side where the liquid is sprayed, and the nozzle 20 is positioned substantially at the center in the thickness direction of the nozzle head 21. These are arranged side by side along the width direction (long side direction).

  As shown in FIG. 3, in the nozzle head 21, when the nozzles 20 are inserted and fixed in the liquid outflow holes 21b, electric wirings 23 are embedded so that the nozzles 20 are electrically connected. The other electrical wiring 42 from the voltage applying means 40 is connected to one end of the electrical wiring 23.

In this embodiment, the nozzle head 21 is formed of an insulating material (for example, insulating plastic), but the nozzle head 21 is formed of a conductive material or a semiconductive material (a material having a surface resistance of 10 ¹⁰ Ω or less). You may make it do.

However, if the nozzle head 21 is formed of a conductive material or a semiconductive material (a material having a surface resistance of 10 ¹⁰ Ω or less), the nozzle head 21 itself functions as an electrode having the same potential as the nozzle 20, so Therefore, the nozzle head 21 is formed of an insulating material as in this embodiment, using only the nozzle 20 as a conductive material or a semiconductive material (a material having a surface resistance of 10 ¹⁰ Ω or less). Is preferred.

FIG. 4 is a plan view for explaining the spraying of the liquid by the electrostatic spraying device 10.
When a voltage is applied between the object to be coated 30 and the nozzle 20 by the voltage applying means 40 described above, an electrostatic force is generated between the object to be coated 30 and the nozzle 20, and the liquid supplied to the nozzle 20 by the electrostatic force is generated. As shown in FIG. 4, the toner is charged and pulled forward by an electrostatic force to be detached from the nozzle 20 in a charged state.

  More specifically, as shown in the enlarged view of FIG. 4, the electrostatic force that pulls the liquid forward is balanced against the adhesion force due to the surface tension and viscosity on the outer peripheral edge 20 a of the nozzle 20. A tailor cone 60 is formed in which the liquid supplied to the tip side of 20 has a conical shape at the tip.

The tailor cone 60 is formed in a conical shape by causing a meniscus at the tip of the nozzle 20 charged with an excess charge to be deformed by separation of positive / negative charges in the liquid by the action of an electric field.
Then, the liquid is pulled straight from the tip of the tailor cone 60 by electrostatic force, and then the liquid is sprayed by electrostatic explosion.

  In some cases, the boundary between the tailor cone 60 and the portion of the liquid that is pulled straight from the tailor cone 60 and extends to the front side may not be clear, but as a whole, the liquid extends so as to become thinner toward the front side.

  The liquid to be sprayed, that is, the liquid that has been separated from the nozzle 20 into liquid particles, has a drastically larger area in contact with air than before the separation, so that the evaporation of the solvent is promoted. The distance between the charged electrons is reduced as the gas is evaporated, electrostatic repulsion (electrostatic explosion) occurs, and the liquid particles are further divided 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.

  Here, as in the present embodiment, when a plurality of nozzles 20 are densely arranged, it becomes a state close to the presence of one large electrode, so the electrostatic force acting on each nozzle 20 is weak. Become.

  For this reason, the nozzle 20 is also used in the liquid pulled forward by the electrostatic force from the nozzle 20 (the portion of the liquid from the nozzle 20 until the electrostatic explosion occurs may be referred to as the liquid line 61). In the position immediately adjacent to, the action (pulling force) of the electrostatic force is weak, and the electrostatic force acting on the liquid line 61 increases as the distance from the nozzle 20 increases.

  However, when the liquid lines 61 are close to each other, the electrostatic force at the tip 61a of each liquid line 61 does not easily increase even when the liquid lines 61 are separated from each other, and the electrostatic force does not act stably. I noticed that it may become unstable and a stable electrostatic explosion may not occur.

  Therefore, in order to increase and stabilize the electrostatic force acting on the liquid line 61 by increasing the distance between the liquid lines 61 as the distance from the nozzle 20 increases, the present embodiment is shown in FIG. As described above, the nozzles 20 are provided such that the distance between the axes L increases as the axes L of all the nozzles 20 move away from the nozzle head 21.

  Specifically, the shape of the end surface on which the nozzle 20 of the nozzle head 21 is provided is a curved shape, and the nozzle 20 is arranged so that the nozzle 20 faces in the normal direction of the curved shape.

  In this way, the action of the electrostatic force is weak at the point just coming out of the nozzle 20, the liquid line 61 is pulled by a weak pulling force, and the action between the adjacent liquid lines 61 decreases as the distance from the nozzle 20 increases. Since the electrostatic force strongly acts on the liquid line 61, the liquid line 61 is pulled by a strong pulling force, and the liquid line 61 extends so as to be stably tapered.

  As a result, the liquid line 61 is tapered, so that the electrostatic force is more likely to act, and further, the electrostatic force is concentrated on the tip of the charged liquid that is pulled so as to be tapered, and between the electrons on the surface of the liquid. Since the liquid is sprayed by the electrostatic explosion due to the repulsive force, good atomization can be performed.

  On the other hand, as described above, when the liquid lines 61 are close to each other and the electrostatic force does not act strongly and stably on the tip 61a of each liquid line 61, the charged state of the liquid is not stable. The electric explosion itself becomes unstable, and good spraying may not be possible.

  Surprisingly, when the liquid line 61 extends so as to be tapered as in the present embodiment, the front end 61a of the liquid extending forward is caused by a change in voltage of the voltage application means 40, a change in humidity, or the like. It seems that a function of self-adjustment so that the tip 61a is located at a position where a uniform electrostatic explosion occurs due to a change in the tip position where the electrostatic explosion occurs with respect to a change in electrostatic force, etc. The electrostatic spraying device 10 of the present embodiment can spray more stably.

(Second Embodiment)
By the way, although it showed about the case where the nozzle 20 was provided so that it might protrude from the nozzle head 21 ahead, it does not necessarily need to protrude and it is substantially the same as the front end surface of the nozzle head 21. Alternatively, the tip of the nozzle 20 may be positioned.
However, as described above, when the nozzle head 21 is formed of an insulating material, it is preferable that the nozzle 20 protrudes from the nozzle head 21.

  For example, when liquid dripping from the nozzle 20 occurs and the liquid electrically connected to the nozzle 20 adheres to the nozzle head 21, the liquid acts as an electrode having the same potential as the nozzle 20. This is the same state as when a new electrode is provided on the surface.

  Then, the action of the electrostatic force on the nozzle 20 in which the dripping or the like has occurred becomes different from the action of the electrostatic force on the nozzle 20 in which no such dripping or the like has occurred, and the nozzle 20 that has caused the dripping or the like. Is different from the spray state of the other nozzles 20.

On the other hand, if the nozzle 20 protrudes from the nozzle head 21, even if dripping or the like occurs, the adhesion of the liquid often remains on the outer peripheral surface of the nozzle 20. In this case, a new surface is formed on the surface of the nozzle head 21. Since the part which becomes an electrode does not generate | occur | produce, it can suppress that the effect | action of the electrostatic force with respect to the nozzle 20 changes.
Therefore, when the nozzle head 21 is formed of an insulating material, it is preferable that the nozzle 20 protrudes from the nozzle head 21.

As described in the first embodiment, when the liquid line 61 is formed so as to stably extend, a voltage change or a humidity change of the voltage applying means 40 occurs or the liquid line 61 is applied to the nozzle head 21 made of an insulating material. Even if the material adheres, stable atomization is possible.
Therefore, in the second embodiment, even if liquid adheres to the surface of the nozzle head 21, it is possible to prevent the generation of a part that becomes a new electrode, suppress the change in the action of electrostatic force on the nozzle 20, and more stably. The electrostatic spraying device 10 to which the configuration in which the liquid line 61 is extended will be described.

FIG. 5 is a perspective view of the electrostatic spraying device 10 of the second embodiment.
As shown in FIG. 5, the basic configuration of the electrostatic spraying device 10 of the second embodiment is the same as that of the first embodiment, and the following mainly describes differences from the first embodiment. Description of points may be omitted.

  In the electrostatic spraying device 10 of the second embodiment, in addition to the configuration of the first embodiment, in the vicinity of the base portion on the nozzle head 21 side of the nozzle 20 protruding from the nozzle head 21 so as to correspond to all the nozzles 20. One provided electrode part 20b is provided.

As shown in FIG. 5, the electrode portion 20 b is connected to an electric wiring 42 a branched from the other electric wiring 42 electrically connected to the nozzle 20 from the voltage applying means 40, and has the same potential as the nozzle 20. It has become.
In addition, the electrode part 20b may be integrally formed with the nozzle 20 so that the electrode part 20b is integrally connected to the plurality of nozzles 20, and the electrical wiring 42a may be omitted.

If such an electrode portion 20b is provided, as described above, the concentration of electrostatic force does not occur in the vicinity of the electrode portion 20b. Therefore, the action of the electrostatic force is weakened, and electrostatic explosion occurs near the nozzle 20. Therefore, the liquid pulls in the direction of the object 30 to be applied to the liquid, so that the liquid stably extends forward.
On the other hand, the electrostatic force becomes stronger as the electrode portion 20b is separated from the electrode portion 20b, and the liquid further extends toward the front side while becoming thinner, and when the tip 61a reaches an electrostatic force that causes an electrostatic explosion due to the concentration of the electrostatic force, the electrostatic force is reached. Causes an electrical explosion.

As described above, when the electrode portion 20b is provided, a state in which the liquid line 61 (not shown) can be satisfactorily extended can be created, so that a more stable electrostatic explosion of the liquid can be realized. Stable atomization can be realized.
Further, even if the liquid adheres to the surface of the nozzle head 21, an electric field of electrostatic force that causes an electrostatic explosion stably is already formed by the electrode portion 20 b, and the nozzle of the liquid adhering to the surface of the nozzle head 21 is formed. The influence of the change of the action of the electrostatic force on 20 is small, and stable atomization can be realized.

  In the present embodiment, holes 20c through which each nozzle 20 passes are provided as electrode portions 20b having a length corresponding to the arrangement length of the nozzles 20 so as to correspond to all the nozzles 20. Thus, the electrode portion 20b is mounted from the tip side of the nozzle 20.

  However, unlike the present embodiment, it is not necessary to configure the electrode portion 20b as one electrode portion, and the electrode portion 20b has a plurality of portions near the root portion on the nozzle head 21 side of the nozzle 20 protruding from the nozzle head 21. The nozzles 20 may be provided individually corresponding to each of the nozzles 20, and similar effects can be obtained in this way.

(Third embodiment)
In the second embodiment, by providing the electrode portion 20b in the vicinity of the base portion on the nozzle head 21 side of the nozzle 20 made of a conductive material protruding from the nozzle head 21 made of an insulating material, the stability of spraying of the liquid is improved. The same thing can be made by designing the shape of the nozzle 20, and in the third embodiment, a configuration for improving the stability of spraying the liquid by devising the shape of the nozzle 20 will be described. .

FIG. 6 is a plan view for explaining the electrostatic spraying device 10 of the third embodiment.
In FIG. 6, only the nozzle head 21 provided with the nozzle 20 is shown.
The basic configuration of the electrostatic spraying device 10 of the third embodiment is the same as that of the first embodiment. Hereinafter, differences from the first embodiment will be mainly described, and description of similar points will be omitted. There is a case.

  In the first embodiment, the nozzle 20 has a straight tubular shape. However, as shown in FIG. 6, in the nozzle 20 of the third embodiment, the outer diameter of the tip of the nozzle 20 is the same as that of the first embodiment. Thus, the root of the nozzle 20 protruding from the nozzle head 21 on the nozzle head 21 side has a larger outer shape than the tip of the nozzle 20.

In the present embodiment, the taper shape is formed so that the outer shape gradually increases toward the root portion side. However, the taper shape is not necessary, and the root portion of the nozzle 20 is the electrode portion 20b described in the second embodiment. It only needs to be large enough to perform the same function as (see FIG. 5).
In other words, at the root portion where the outer diameter is larger than the tip of the nozzle 20 of the conductive material, the concentration of electrostatic force does not occur, the action of the electrostatic force is weak, and it is large enough not to cause an electrostatic explosion near the nozzle 20. Therefore, it is only necessary that the force to pull the liquid in the direction of the object to be coated 30 is strong, and the liquid is stably extended to the front side.

For example, as shown in FIG. 6, the root portion of the nozzle 20 may have an outer shape larger than the tip portion of the nozzle 20 so that the distance D between the root portions of adjacent nozzles 20 is 5 mm or less. It is preferable that the distance D is 3 mm or less.
Even in this case, as in the second embodiment, as the nozzle 20 moves away from the base portion having a large outer diameter, the electrostatic force acts more strongly, and the liquid further extends toward the front side while becoming thinner, and the tip When 61a reaches an electrostatic force causing electrostatic explosion due to concentration of electrostatic force, electrostatic explosion occurs.
In addition, when the outer shape of the root portion of the nozzle 20 is large, the area of the root portion that contributes as the electrode increases, so that liquid adheres to the surface of the nozzle head 21 and the attached liquid is an electrode near the root portion. However, since the contribution of the base part of the nozzle 20 as an electrode is large, the influence of the electrostatic force acting on the nozzle 20 of the liquid adhering to the surface of the nozzle head 21 is small and stable atomization. Can be realized.

  In addition, in the shape of the straight tubular nozzle 20 of the first embodiment, when the outer shape is enlarged including not only the root portion of the nozzle 20 protruding from the nozzle head 21 on the nozzle head 21 side but also the tip portion of the nozzle 20. Since the electrostatic force acting on the tip of the nozzle 20 becomes too weak and the liquid cannot be pulled sufficiently, the tip of the nozzle 20 does not have a large outer shape as in this embodiment. It is preferable that 20 root parts have a large outer shape.

  In this way, even by devising the shape of the nozzle 20, it is possible to achieve the same operation as that of the electrode portion 20b (see FIG. 5) described in the second embodiment, so that it is stable as in the second embodiment. Spraying of the liquid is possible.

(Fourth embodiment)
In the first to third embodiments, the nozzles 20 are provided such that the distance between the axis lines L increases as the axis lines L of all the nozzles 20 move away from the nozzle head 21. As the axis L of the nozzle 20 moves away from the nozzle head 21, the distance between the axes L need not be increased.

  In other words, the distance between the axis lines L need only be performed between adjacent nozzles 20 having a large influence, and the distance between the axis lines L between the nozzles 20 that are further away from each other is larger. There is no need to leave the nozzle 20 apart, and the nozzle 20 may be arranged as shown in FIG.

FIG. 7 is a perspective view for explaining the electrostatic spraying device 10 of the fourth embodiment.
In FIG. 7, only the nozzle head 21 provided with the nozzle 20 is shown.
As shown in FIG. 7, also in the fourth embodiment, the nozzle head 21 has a rectangular shape when viewed from the side where the liquid is sprayed, and the nozzle 20 extends along the width direction (long side direction) of the nozzle head 21. They are arranged side by side.
However, unlike the past, the end surface of the nozzle head 21 where the nozzles 20 are provided is not curved, and thus the nozzles 20 are arranged in a straight line.

The nozzles 20 are arranged in a staggered manner across the center M in the thickness direction of the nozzle head 21, and the nozzles 20 are inclined toward the side farther from the center M toward the tip side with respect to the center M. A nozzle 20 is disposed.
When the nozzles 20 are arranged in this way, the nozzles 20 located on one side and the nozzles 20 located on the other side across the center M are arranged so as to incline toward each other. As the distance from the nozzle head 21 increases, the distance between the axis lines L increases.

  In order to incline the nozzles 20 adjacent to each other in this way, the end surface of the nozzle head 21 where the nozzle 20 is provided is inclined to the rear side of the nozzle head 21 with the center M interposed therebetween. .

On the other hand, in the case of the mode shown in FIG. 7, the distance between the axis lines L is the same as d even at a position away from the nozzle head 21 when viewed between the nozzles 20 that are skipped by one.
However, since the distance between the nozzles 20 that are skipped is sufficiently large, there is no problem even if the distance between the axes L remains unchanged as described above.
Note that the fourth embodiment is the same as the first embodiment except for the configuration related to the arrangement of the nozzles 20 described above.

As mentioned above, although the electrostatic spraying apparatus 10 of this invention has been demonstrated based on specific embodiment, this invention is not limited to said specific embodiment.
For example, a proximity electrode that mainly contributes to the spraying of the liquid and serves as a different pole portion with respect to the nozzle 20 disposed in the vicinity of the nozzle 20 may be added. When such a proximity electrode is provided, the proximity electrode May be set to an intermediate potential between the potential of the object 30 and the potential of the nozzle 20.

  As described above, the present invention is not limited to the above-described embodiment, and modifications and improvements as appropriate are also included in the technical scope of the present invention. It is clear from the description of the scope of claims.

DESCRIPTION OF SYMBOLS 10 Electrostatic spray apparatus 20 Nozzle 20a Tip outer periphery 20b Electrode part 20c Hole 21 Nozzle head 21a Liquid supply port 21b Liquid outflow hole 21c Liquid branch part 23 Electric wiring 30 Coating object 40 Voltage application means 41 One electric wiring 42 The other Electrical wiring 50 Grounding means 60 Tailor cone 61 Liquid line 61a Tip L Axis line

Claims (7)

An electrostatic spraying device that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by applying a voltage;
A nozzle head provided with a plurality of the nozzles of a conductive material or a semiconductive material;
A voltage applying means for generating the electrostatic force by applying a voltage between different polar parts with respect to the nozzle,
The electrostatic spraying device according to claim 1, wherein the nozzle is provided such that a distance between the axes increases as the axis of the nozzle moves away from the nozzle head between at least adjacent nozzles.   The electrostatic spraying device according to claim 1, wherein the nozzles are provided such that a distance between the axes increases as the axes of all the nozzles move away from the nozzle head. An electrostatic spraying device that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by applying a voltage;
A nozzle head of insulating material provided with a plurality of said nozzles of conductive material or semiconductive material;
A voltage applying means for generating the electrostatic force by applying a voltage between different polar parts with respect to the nozzle,
The nozzle is provided so as to protrude from the nozzle head,
Providing corresponding to each of the plurality of nozzles in the vicinity of the base portion on the nozzle head side of the nozzle protruding from the nozzle head, and having a plurality of electrode portions having the same potential as the nozzle. Electrostatic spraying device. An electrostatic spraying device that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by applying a voltage;
A nozzle head of insulating material provided with a plurality of said nozzles of conductive material or semiconductive material;
A voltage applying means for generating the electrostatic force by applying a voltage between different polar parts with respect to the nozzle,
The nozzle is provided so as to protrude from the nozzle head,
One electrode part having the same potential as that of the nozzle is provided near the root part on the nozzle head side of the nozzle protruding from the nozzle head so as to correspond to all the nozzles. Electrostatic spraying device. An electrostatic spraying device that sprays the liquid onto the object to be coated by detaching the liquid from the nozzle in a charged state by electrostatic force generated by applying a voltage;
A nozzle head of insulating material provided with a plurality of said nozzles of conductive material or semiconductive material;
A voltage applying means for generating the electrostatic force by applying a voltage between different polar parts with respect to the nozzle,
The nozzle is provided so as to protrude from the nozzle head, and a root portion of the nozzle protruding from the nozzle head on the nozzle head side has an outer shape larger than a tip portion of the nozzle. Electrostatic spray device.   The said root part of the said nozzle is made into the external shape larger than the front-end | tip part of the said nozzle so that the distance with the said root part of the said adjacent nozzle may be 5 mm or less. Electrostatic spraying device.   The electrostatic spraying device according to any one of claims 1 to 6, wherein the nozzles are arranged side by side along a width direction of the nozzle head.

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