Electrospray nozzle and electrospray device

Abstract

To provide a device for coating a liquid by an electrospray ionization method which increases a coating amount per unit time while performing stable atomization.SOLUTION: A nozzle for electrospray is a nozzle for electrospray for spraying a liquid by an electrospray ionization method includes an electrode member which has a plurality of liquid channels that are formed into groove shapes and can flow a coating liquid supplied from the outside and can apply a voltage supplied from the outside to the coating liquid flowing in the liquid channels.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE The present invention relates to a nozzle for electrospraying and an electrospraying device. [Background technology]

[0002] In recent years, electrospray has been attracting attention as a coating technique for paints and cleaning fluids. In electrospray, a high voltage is applied to coating fluids such as paints and cleaning fluids, the coating fluid flowing out from the tip of a nozzle is atomized by electrostatic force, and the high-voltage-charged atomized coating fluid is attracted to the substrate, which serves as the counter electrode, and then applied. In electrospray, gas such as air is not used to atomize the coating fluid, i.e., to make it fine particles, and the charged coating fluid is attracted to the substrate by electrostatic force and adsorbed thereon, so that the coating fluid is less diffused and the coating efficiency is high. Therefore, compared to conventional air spray, electrospray can reduce the amount of coating fluid used and the amount of waste fluid treatment, and is therefore expected to be a technology that can reduce environmental impact.

[0003] However, because the electrospray method does not use external forces such as air pressure to atomize the coating liquid as in the conventional air spray method, the amount of coating per unit time is smaller than that of the conventional air spray method, making it difficult to apply the conventional electrospray method to applications that require a large amount of coating in a short period of time, such as painting in a production process. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-526334 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an electrospray nozzle and an electrospray device that can increase the amount of liquid applied per unit time while performing stable atomization in applying a liquid by electrospray ionization. [Means for solving the problem]

[0006] The electrospray nozzle of the embodiment is a nozzle for electrospray that sprays a liquid by electrospray ionization, has a plurality of liquid flow paths formed in a groove shape and capable of flowing a coating liquid supplied from the outside, and is equipped with an electrode member capable of applying a voltage supplied from the outside to the coating liquid flowing in the liquid flow paths.

[0007] The electrospray device of the embodiment includes the electrospray nozzle described above, a coating liquid supplying device that supplies a coating liquid to the liquid flow path of the electrospray nozzle, and a voltage supplying device that supplies a voltage to the electrode member of the electrospray nozzle. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration of an electrospray device according to an embodiment. [Diagram 2] FIG. 1 is a perspective view showing an example of a nozzle for electrospray according to an embodiment. [Diagram 3] FIG. 1 is a cross-sectional view showing a schematic example of a nozzle for electrospray according to an embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line X4-X4 of FIG. 3, which is a schematic diagram showing an example of an electrospray nozzle according to an embodiment. [Diagram 5] FIG. 1 is a cross-sectional view showing an example of an electrospray nozzle according to a first modified example. [Figure 6] FIG. 11 is a cross-sectional view showing an example of an electrospray nozzle according to a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a number of embodiments will be described with reference to the drawings. Note that substantially the same elements in the number of embodiments will be denoted by the same reference numerals, and the description thereof will be omitted.

[0010] The electrospray device 1 shown in FIG. 1 is a device that can spray a coating liquid, such as paint or cleaning liquid, by an electrospray method, thereby coating a coating liquid on a coating object 90. That is, the electrospray device 1 in FIG. 1 can be applied to a coating device for coating a product with paint in a production process or the like, or a cleaning device for coating a product with cleaning liquid and cleaning the product. That is, the electrospray device 1 can also be called, for example, a coating device or a cleaning device depending on its application. Note that the application of the electrospray device 1 is not limited to the above-mentioned coating device or cleaning device, and can be widely applied to devices for coating a coating liquid on a coating object.

[0011] As shown in Fig. 1, the electrospray device 1 includes a coating liquid supply device 10, a gas supply device 20, a voltage supply device 30, a control device 40, a support member 50, and an electrospray nozzle 60. In the following description, the electrospray nozzle will be simply referred to as a nozzle. In this embodiment, the lower side of the paper in Fig. 1 is the side in the ejection direction of the coating liquid and corresponds to the tip side of the nozzle 60, and the upper side of the paper in Fig. 1 is the side opposite to the ejection direction of the coating liquid and corresponds to the base end side of the nozzle 60.

[0012] The coating liquid supplying device 10 is for supplying coating liquid such as paint and cleaning liquid to the nozzle 60. In the present embodiment, the coating liquid supplying device 10 has a coating liquid tank 11 and a coating liquid supply pump 12. The coating liquid tank 11 stores coating liquid such as paint and cleaning liquid. The coating liquid supply pump 12 has a function of supplying the coating liquid in the coating liquid tank 11 to the nozzle 60 at a predetermined discharge pressure.

[0013] The suction port of the coating liquid supply pump 12 is connected to the coating liquid tank 11 via the coating liquid hose 13. The discharge port of the coating liquid supply pump 12 is connected to the nozzle 60 via the coating liquid hose 13 and the support member 50. The coating liquid discharged from the coating liquid supply pump 12 is supplied to the nozzle 60 via the coating liquid hose 13 and the support member 50. In the case of this embodiment, the coating liquid hose 13 is made of, for example, a synthetic resin having electrical insulation properties. In addition, the coating liquid supply pump 12 is made of, for example, a syringe pump, and can control the amount of coating liquid supplied to the nozzle 60 with high precision. Note that the coating liquid supply pump 12 is not limited to a syringe pump.

[0014] The gas supply device 20 is for supplying gas to the nozzle 60. The gas supplied from the gas supply device 20 is an insoluble gas that does not dissolve in the coating liquid or a poorly soluble gas that is difficult to dissolve, and can be, for example, an inert gas such as compressed air or nitrogen. The gas supply device 20 can be composed of, for example, a compressor that generates compressed air, a gas cylinder filled with compressed gas, and a regulator that adjusts the outflow pressure of the gas from the gas cylinder. In the case of this embodiment, the gas supply device 20 is composed of an air compressor.

[0015] The discharge port of the gas supply device 20 is connected to the nozzle 60 via the gas hose 21 and the support member 50. The gas discharged from the gas supply device 20 is supplied to the nozzle 60 via the gas hose 21 and the support member 50. In the case of this embodiment, the gas hose 21 is made of, for example, a synthetic resin having electrical insulation properties.

[0016] The voltage supply device 30, which may also be referred to as a power supply device, has a function of applying a high voltage of several kV to several tens of kV between the nozzle 60 and the object to be coated 90. The voltage supply device 30 has a boost circuit and a rectifier circuit, and supplies the voltage required to drive the electrospray device 1, that is, the high DC voltage required to charge and atomize the coating liquid. The output side of the voltage supply device 30 is connected to the nozzle 60 via a power cable 31. In addition, the voltage supply device 30 and the object to be coated 90 are grounded via an earth wire 32.

[0017] The control device 40 is configured to have a microcomputer having a CPU, ROM, RAM, etc. (not shown). In the present embodiment, the control device 40 is electrically connected to the coating liquid supply device 10 (in this case, the coating liquid supply pump 12), the gas supply device 20, and the voltage supply device 30, and can control the amount of coating liquid discharged from the coating liquid supply pump 12, the amount of gas discharged from the gas supply device 20, and the output voltage of the voltage supply device 30. This allows the control device 40 to automatically or semi-automatically control the amounts of coating liquid and gas supplied to the nozzle 60 and the voltage applied to the coating liquid.

[0018] It should be noted that the electrospray device 1 does not necessarily need to include the control device 40. If the electrospray device 1 does not include the control device 40, a user of the electrospray device 1 manually adjusts the coating liquid supply pump 12, the gas supply device 20, and the voltage supply device 30 to adjust the amount of coating liquid supplied, the amount of gas supplied, and the applied voltage.

[0019] The support member 50 has a function of supporting the nozzle 60 with the nozzle 60 attached thereto, and also connecting the coating liquid hose 13 and the gas hose 21 to the nozzle 60. In this embodiment, the support member 50 is made of a non-metallic material such as non-conductive plastic. In this embodiment, the nozzle 60 is configured to be detachable from the support member 50. This allows the user to easily take measures when, for example, the nozzle 60 becomes clogged with the coating liquid and maintenance becomes necessary.

[0020] The nozzle 60 has a function of spraying the coating liquid supplied from the coating liquid supplying device 10 by electrospray ionization. In the case of this embodiment, the nozzle 60 has an electrode member 70 and a housing 80, as shown in Figs. 2 to 4.

[0021] The electrode member 70 is made of a conductive material, such as a metal material. The electrode member 70 can be made of, for example, aluminum, iron, gold, silver, titanium, stainless steel, or chromium, but is not limited to these. The electrode member 70 has a function of contacting the coating liquid supplied from the coating liquid supply device 10 and applying the high voltage supplied from the voltage supply device 30 to the coating liquid.

[0022] In this embodiment, the electrode member 70 is formed by processing, for example, a metal plate member. As shown in Figs. 2 and 4, the electrode member 70 has a plurality of liquid flow paths 71. Each liquid flow path 71 is formed in a groove shape by digging at least one surface of the electrode member 70 in the thickness direction. Each liquid flow path 71 extends linearly and is arranged in parallel to each other. In this embodiment, as shown in Fig. 4, the liquid flow path 71 is formed in a semicircular shape that is open in one direction when cut in a plane perpendicular to the extension direction of the liquid flow path 71. Note that the liquid flow path 71 may be formed in a rectangular shape when cut in a plane perpendicular to the extension direction of the liquid flow path 71.

[0023] Each liquid flow path 71 is directly or indirectly connected to the coating liquid supply device 10. In this embodiment, each liquid flow path 71 is connected to the coating liquid supply pump 12 of the coating liquid supply device 10 via the support member 50 and the coating liquid hose 13. The coating liquid discharged from the coating liquid supply pump 12 is supplied to the nozzle 60 from the support member 50 and the coating liquid hose 13, and branches into each liquid flow path 71. In each drawing, arrow A indicates the flow of the coating liquid. A voltage supplied from the outside of the nozzle 60, in this case the voltage supply device 30 to the electrode member 70, is applied to the coating liquid flowing through each liquid flow path 71.

[0024] In this embodiment, the electrode member 70 has a shape in which the tip side of the electrode member 70, i.e., the downstream side of the flow of the coating liquid, is bent. The liquid flow path 71 is formed up to the tip of the electrode member 70 in the flow direction of the coating liquid. That is, the liquid flow path 71 of this embodiment is configured to have a base end region 711 and a tip end region 712, as shown in Figures 2 and 3. The tip end region 712 is disposed at an angle with respect to the base end region 711.

[0025] In this embodiment, the base end region 711 is a portion of the liquid flow path 71 provided in the electrode member 70 that is horizontally disposed when the nozzle 60 is used, and is provided upstream of the tip end region 712, i.e., on the base end side of the nozzle 60. The tip end region 712 is a portion of the liquid flow path 71 provided in the electrode member 70 that is inclined downward toward the workpiece 90 when the nozzle 60 is used, and is provided downstream of the base end region 711, i.e., on the tip side of the nozzle 60. In this embodiment, the entire length of the base end region 711 is set longer than the entire length of the tip end region 712 in each liquid flow path 71. Then, as shown in FIG. 2 and FIG. 3, at least a part or all of the tip end region 712 is exposed to the outside from the housing 80. Also, the tip of the tip end region 712, i.e., the tip portion of the electrode member 70, is pointed so as to taper, as shown in FIG. 2.

[0026] In this case, the thickness of the electrode member 70 in the tip region 712 is preferably 100 μm or less, and more preferably 30 μm or less. In the present embodiment, the thickness of the electrode member 70 in the tip region 712 is set to 20 μm or more and 100 μm or less.

[0027] The housing 80 constitutes the outer shell of the nozzle 60, and contains a part of the electrode member 70, and has a function of flowing the coating liquid supplied from the coating liquid supply device 10 and the gas supplied from the gas supply device 20 inside. The housing 80 can be made of, for example, a resin material having electrical insulation. The housing 80 is formed, for example, in a cylindrical shape. In the case of this embodiment, the housing 80 is formed in a cylindrical shape having a rectangular cross section. The housing 80 has a liquid outlet 81, a gas flow path 82, a gas outlet 83, and an induction section 84. That is, in the case of this embodiment, the housing 80 functions as a gas flow path forming member for forming the gas flow path 82.

[0028] The liquid outlet 81 is an outlet for allowing the coating liquid introduced into the housing 80 to flow out of the housing 80. The coating liquid supplied from the coating liquid supplying device 10 and introduced into the housing 80 flows along the liquid flow path 71 of the electrode member 70 and flows out of the housing 80 from the liquid outlet 81.

[0029] The gas flow path 82 is formed in a space provided in the housing 80, and extends along the extension direction of the liquid flow path 71. The gas flow path 82 can be formed, for example, in a rectangular, elliptical, or oval shape with a cross section that is long in one direction when cut along a plane perpendicular to the extension direction of the gas flow path 82, i.e., the direction in which the gas flows. In the case of this embodiment, the cross section of the gas flow path 82 is formed in a rectangular shape with a long horizontal direction.

[0030] In the case of this embodiment, in the portion of the electrode member 70 housed in the housing 80, the surface on which the liquid flow path 71 is provided is separated from the inner surface of the housing 80, and the surface opposite to the surface on which the liquid flow path 71 is provided, i.e., the surface on which the liquid flow path 71 is not provided, contacts the inner surface of the housing 80. The gas flow path 82 is formed by the space between the surface of the electrode member 70 on the liquid flow path 71 side and the inner surface of the housing 80.

[0031] The gas flow path 82 is directly or indirectly connected to the gas supply device 20. In the present embodiment, the gas flow path 82 is connected to the gas supply device 20 via the support member 50 and the gas hose 21. The gas supplied to the gas flow path 82 from the gas supply device 20 via the gas hose 21 and the support member 50 flows through the gas flow path 82 along the extension direction of the liquid flow path 71. In each drawing, the arrow B indicates the flow of gas.

[0032] The gas outlet 83 is an outlet for discharging the gas introduced into the housing 80 to the outside of the housing 80. The guide section 84 is provided on the tip side of the liquid flow path 71 in the housing 80. The guide section 84 has a function of separating the gas flowing through the gas flow path 82 from the coating liquid flowing through the liquid flow path 71, that is, a function of guiding the gas in a direction away from the liquid flow path 71. The guide section 84 is provided between the liquid outlet 81 and the gas outlet 83, and separates the liquid outlet 81 from the gas outlet 83. The guide section 84 is formed, for example, in a flat plate shape and is inclined in the opposite direction to the inclination direction of the tip side region 712, in this case, upward.

[0033] The gas supplied from the gas supply device 20 and introduced into the housing 80 flows along the gas flow path 82 inside the housing 80, and then flows out of the housing 80 from the gas outlet 83. At this time, the gas flowing through the gas flow path 82 is guided by the guide portion 84, and flows out of the gas outlet 83 in the opposite direction to the inclination direction of the tip side region 712, in this case, the upward direction. Also, in this case, the speed of the gas flowing through the gas flow path 82 can be made different from the speed of the coating liquid flowing through the liquid flow path 71.

[0034] In this configuration, the coating liquid supplied from the coating liquid supply pump 12 into the housing 80 branches into a plurality of liquid flow paths 71 of the electrode member 70 housed in the housing 80 and flows. The coating liquid is charged to a high voltage when it comes into contact with the liquid flow path 71 formed by the electrode member 70, and springs out from the liquid outlet 81 to the tip side region 712. The coating liquid that springs out from the liquid outlet 81 to the tip side region 712 becomes spherical due to the surface tension of the coating liquid. At this time, an electrostatic force is generated between the coating liquid that has become spherical in the tip side region 712 and the coating object 90 that serves as the opposing electrode, and the tip of the spherical coating liquid is attracted to the coating object 90 side. Then, as shown in FIG. 3, a conical Taylor cone T is formed.

[0035] When the electrostatic force acting on the coating liquid becomes greater than the surface tension of the coating liquid, charged droplets D charged to a high voltage are released from the tip of the Taylor cone T. These charged droplets D are gradually broken down into fine particles and atomized due to repulsion caused by electrostatic force and promotion of evaporation of the liquid. The fine droplets in the atomized state are attracted to the workpiece 90 by electrostatic force and adsorbed to the workpiece 90.

[0036] According to the embodiment described above, the nozzle 60 is an electrospray nozzle that sprays liquid by electrospray ionization, and includes an electrode member 70. The electrode member 70 is formed in a groove shape and has a plurality of liquid flow paths 71 through which the coating liquid supplied from the coating liquid supply device 10 can flow, and a voltage supplied from the outside can be applied to the coating liquid flowing through the liquid flow paths 71. The electrospray device 1 also includes the nozzle 60, the coating liquid supply device 10 that supplies the coating liquid to the liquid flow paths 71 of the nozzle 60, and a voltage supply device 30 that supplies a voltage to the electrode member 70 of the nozzle 60.

[0037] Here, for example, a simple cylindrical shape may be adopted as the shape of the nozzle for electrospray. In this case, the electrode for applying a high voltage to the coating liquid flowing through the nozzle may be, for example, a cylindrical rod-shaped core material passing through the nozzle, or the inner surface of the nozzle may be used as an electrode. In these configurations, in order to increase the coating amount per unit time, it is necessary to increase the diameter of the nozzle, that is, the cross-sectional area of ​​the nozzle.

[0038] However, in the case of the former configuration, it has been found that even if the diameter of the core material is increased, the atomization efficiency of the coating liquid does not improve in proportion to the increase in the diameter. Also, in the latter configuration, the cross-sectional area of ​​the nozzle is proportional to the square of the nozzle radius, while the circumference of the nozzle is proportional to the nozzle radius. Therefore, even if the nozzle diameter is increased in the latter configuration, the contact area of ​​the electrode with the coating liquid does not increase in proportion to the increase in the amount of coating liquid, so the stability of atomization of the coating liquid decreases. Therefore, in the conventional configuration, it was difficult to increase the amount of coating in a configuration that adopted the electrospray ionization method.

[0039] In contrast, in the nozzle 60 of this embodiment, the electrode member 70 has a plurality of liquid flow paths 71, and is configured to be able to apply a voltage supplied from the outside to the coating liquid flowing through the liquid flow paths 71. According to this, the flow rate of the coating liquid can be secured by the plurality of liquid flow paths 71, while the contact area with the electrode member 70 can be secured. Therefore, according to the electrospray device 1 using the nozzle 60 of this embodiment, it is possible to increase the coating amount per unit time while performing stable atomization. And, as a result, the electrospray device 1 using the nozzle 60 of this embodiment can be applied to, for example, a coating device or a cleaning device that coats a large amount per unit time. As a result, according to this embodiment, it is possible to reduce the amount of coating liquid used and the amount of waste liquid treatment compared to the conventional air spray method, and thus contribute to reducing the environmental load.

[0040] Furthermore, the liquid flow path 71 has a base end region 711 and a tip end region 712. The base end region 711 is a region of the liquid flow path 71 that is disposed horizontally when in use. The tip end region 712 is provided downstream of the base end region 711, is bent with respect to the base end region 711, and is inclined downward when in use.

[0041] In this configuration, the coating liquid supplied into the nozzle 60 first flows horizontally in the base end region 711, and then flows downward along the inclination of the tip end region 712. This makes it possible to prevent the coating liquid flowing inside the nozzle 60 from forming clumps and falling due to gravity. This makes it possible to prevent clumps of the coating liquid from falling from the nozzle 60 onto the object to be coated, thereby improving the quality of the coating.

[0042] The nozzle 60 further includes a housing 80. In this embodiment, the housing 80 functions as a gas flow path forming member that forms a gas flow path 82 that allows gas supplied from the outside of the nozzle 60 (in this case, the gas supply device 20) to flow along the extension direction of the liquid flow path 71. The electrospray device 1 further includes the gas supply device 20 that supplies gas to the gas flow path 82 of the nozzle 60.

[0043] According to this, by flowing gas through the gas flow path 82, the pressure of the gas can press the coating liquid flowing through the liquid flow path 71 into the liquid flow path 71. This makes it possible to prevent the coating liquid from splashing out of the liquid flow path 71, thereby ensuring contact with the inner surface of the liquid flow path 71, i.e., the electrode member 70, and improving the stability of atomization.

[0044] Furthermore, for example, when the electrospray device 1 is used in a device for applying a non-Newtonian fluid such as paint, the gas flowing through the gas flow passage 82 is a Newtonian fluid, while the paint or the like flowing through the liquid flow passage 71 is a non-Newtonian fluid. For this reason, by flowing the gas, which is a Newtonian fluid, in parallel with the flow of the paint or the like, which is a non-Newtonian fluid, vortices are easily generated in the non-Newtonian fluid flowing through the liquid flow passage 71. The liquid flowing through the liquid flow passage 71 is then stirred by these vortices. As a result, contact with the inner surface of the liquid flow passage 71, i.e., the electrode member 70, is improved, and the stability of atomization can be further effectively improved.

[0045] Here, when the coating liquid and gas introduced into the nozzle 60 are ejected from the nozzle 60 in the same direction, the coating liquid becomes entrained in the gas ejected from the nozzle 60 and tends to diffuse, and as a result, the efficiency of coating onto the workpiece 90 tends to decrease.

[0046] Therefore, the nozzle 60 of this embodiment further includes a guide section 84. In this embodiment, the guide section 84 is provided in the housing 80. The guide section 84 is provided on the tip side of the liquid flow path 71 and has a function of guiding the gas flowing through the gas flow path 82 in a direction away from the liquid flow path 71. That is, the coating liquid and the gas supplied into the nozzle 60 flow in parallel in the same space in the nozzle 60, and then are separated by the guide section 84 and flow out in different directions. This makes it possible to suppress the coating liquid from being entrained in the gas discharged from the nozzle 60 and being diffused, and as a result, it is possible to improve the efficiency of coating on the workpiece 90.

[0047] Next, some modified examples of this embodiment will be described with reference to Figs. 5 and 6. The modified examples shown in Figs. 5 and 6 differ from the above embodiment in the position of the gas outlet 83, i.e., the position of the induction section 84. In Modification 1 shown in Fig. 5, the gas outlet 83 and the induction section 84 are located further toward the tip side of the nozzle 60 than the liquid outlet 81, i.e., the most distal end of the liquid flow path 71. That is, in the example of Fig. 5, the gas outlet 83 and the induction section 84 are provided at the most distal end of the nozzle 60. In this case, the liquid outlet 81 is located on the base end side of the nozzle 60, i.e., downstream side, with respect to the gas outlet 83.

[0048] On the other hand, in Modification 2 shown in Fig. 6, the gas outlet 83 and the guide section 84 are located relative to the liquid outlet 81, that is, on the base end side of the liquid flow path 71. That is, in the example of Fig. 6, the tip side region 712 of the liquid flow path 71 is provided at the most distal end of the nozzle 60. In this case, the gas outlet 83 is located on the base end side of the nozzle 60, that is, on the downstream side, relative to the gas outlet 81. With these, the same effects as those of the above embodiment can be obtained.

[0049] The above-described embodiments are presented as examples, and are not limited to the embodiments described above and shown in the drawings. They can be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0050] Reference Signs List 1: electrospray device, 10: coating liquid supply device, 20: gas supply device, 30: voltage supply device, 60: electrospray nozzle, 70: electrode member, 71: liquid flow path, 80: housing (gas flow path forming member), 82: gas flow path, 84: induction section, 711: base end region, 712: tip end region

Claims

1. A nozzle for electrospray that sprays a liquid by electrospray ionization, comprising: an electrode member having a plurality of liquid flow paths formed in a groove shape and capable of flowing a coating liquid supplied from the outside, and capable of applying a voltage supplied from the outside to the coating liquid flowing through the liquid flow paths; a gas flow path forming member that forms a gas flow path that allows a gas supplied from the outside to flow along the extension direction of the liquid flow path, the coating liquid flowing through the liquid flow path is pressed into the liquid flow path by the pressure of the gas flowing through the gas flow path; Nozzle for electrospray.

2. A nozzle for electrospray that sprays a liquid by electrospray ionization, comprising: a liquid flow path formed in a groove shape and capable of flowing a coating liquid supplied from an outside; and an electrode member capable of applying a voltage supplied from an outside to the coating liquid flowing through the liquid flow path; The liquid flow path has a base end region that is disposed horizontally when in use, and a tip end region that is provided downstream of the base end region, bent with respect to the base end region, and inclined downward when in use. Nozzle for electrospray.

3. The liquid passage further includes a guide portion provided at a tip end side of the liquid passage and configured to guide the gas flowing through the gas passage in a direction away from the liquid passage. The electrospray nozzle according to claim 1 .

4. The electrospray nozzle according to claim 2; a coating liquid supplying device that supplies a coating liquid to the liquid flow path of the electrospray nozzle; a voltage supply device for supplying a voltage to the electrode member of the electrospray nozzle; An electrospray device comprising:

5. The electrospray nozzle according to claim 1 or 3; a coating liquid supplying device that supplies a coating liquid to the liquid flow path of the electrospray nozzle; a gas supply device that supplies a gas to the gas flow path of the electrospray nozzle; a voltage supply device for supplying a voltage to the electrode member of the electrospray nozzle; An electrospray device comprising:

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